[Reprinted from InsecutorInscitie Menstruus,Vol. XII, Noe.4'6, 1924]

UNDESCRIBED SPECIES OF NEMATOCEROUS
DIPTERA FROM NORTH AMERICA
AND JAPAN
Bv CHARLESP. ALEXANDER
The types of the new speciesdescribedat this time are preserved in the writer's collection.exceot where stated to thecontrary.
Family ANISOPODIDAE
Subfamily TRICHOCERINAE
Trichocera bituberculata, new species.
Male.-Length 4.5 mm.; wing 5.7. mm.
Rostrum and palpi black. Antennae brownish black throughout. Head black, gray pruinose.
Mesonotum and pleura black, sparsely pruinose. Halteresbrown, the base of the stem very faintly brightened. Legs withthe coxae and trochanters brown, the fore coxae darker brownat bases; remainder of legs dark brown. Wings with a pale
brown tinge, the stigma slightly darker brown; veins darkbrown. Venation: Sc, ending opposite the fork of Rr*r, Sc,opposite three-fifths the length of Rs; Rr*, a little less than
twice the basal section of Rr; basal deflection of Ca, a little
less than its own length from the outer end of cell rst Mr;
rn f.ully twice the outer deflection of Mr.
MaleAbdomen dark brown, including the hypopygium.
hypopygium with the dististyles elongate, with two small
setigerous tubercles on mesal face, one, a little larger andstouter, at the base, the second at about one-fourth the lengthof the style; mesal face of style beyond these tubercles withshort but not conspicuous dense trichiae. Lateral angles of thephallosome produced caudad and laterad into long, slenderspines.

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rNSEcuToRINscrTrrx MENSTRUUS

Habitat.-Alaska.
Holotype, Q, Bethel, September25,7917 (A. H. Twitchell),Type returned to the collection of the United States Biological Survey.
Paracladura nipponensis, new species.
Femole.-Length 3 mm.; wing 4 mm.
Rostrum liglrt yellowish brown, the palpi brownish black"
Antennae with the scapal segments obscure yellow, the flagellum dark brown, with dark trichiae. Head grayish brown.
Mesonotum brown, the praescutum with two intermediate
darker brown stripes that attain the suture; scutellum moretestaceous. Pleura darker brown. Halteres pale yellow, theextreme baseseven brighter, the knobs dark brown. Legs withthe coxae testaceous,the fore coxae infuscated basally i trochanters yellowish testaceous; femora brownish testaceous,
the remainder of the legs passing into brown. Wings tinged
with pale brown, the stigmal region vaguely darker; veins darkbrown. Venation: Sc, ending opposite r, Sc, opposite twofifths the length of Rs,' Rr*, equal to the basal section of Rr;
petiole of cell M, a little more than one-half the cell i rn-cu
equal to tn, cell Cu, being comespondingly short and broad.
Abdomen dark brown, the caudal margins of the segments
narrowly paler, broader on the sternites. Ovipositor with thevalves broad basally, the tips narrowed, infuscated.
H abitat.-Japan (Kiushiu).
Holotype, ?, Mt. Kirishima, on boundary between Osumi
and Hiuga, altitude 3,250 feet, October 30, 1923 (T. Esaki).
Family CECIDOMYIIDAE
SublamilyLESTREMIINAE
Catocha subobsoleta, new species.
Male.-Length 4.8 mm.; wing 6.4 mm.
Most closely related to C. americans Felt, from which it
differs as follows:
Size larger. Antennae 16-segmented,the basal enlargementsof the fourth to sixth segmentsbroad, fully one-half as broad

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83

as long, on the succeeding segments becoming more elongate;
the apical enlargements of the flagellar segments are indicatedbut are small and setiferous on the outer face. The unique typeis badly discolored. Mesonotum gibbous, reddish brown withtwo darker brown stripes, the humeral region brightened.
Mesopleura with the suture between the anepisternum andsternopleurite complete. Coxae elongate, especially the fore
coxae Wings with Sc entire, ending in C a short distancebeyond r-m; M faint but preserved for its entire length, bending strongly toward Rs so r-m is greatly reduced ; vein znd A
becoming entirely obsolete beyond midlength.
Habitat.-United States (Washington).
Holotype, J, Longmire Springs, Mt. Rainier, June, 1917
(H .G . Dyar ) .
Type in the collection of the United States National Museum.
This interesting gall-midge is distinguished from C. americana
by its larger size and the venational details, especially theshortenedr-cn and the obsoleteapex of vein znd A.
Catocha nipponensis, new species.
Male.-Length 5.5 mm.; wing 8.1 mm.; antenna ?.2 mm.
Antennae dark brown throughout, the elongate basal flagellar
segment with the slightly enlarged basal portion more than fourtimes the glabrous apical pedicel; succeeding flagellar segments with the base slightly enlarged, this longer than theshiny apical pedicel, the latter feebly dilated at the distal end,
but scarcely nodose. Head dark gray.
Mesonotum more flattened dorsally than C. subobsoleta;
suture between the anepisternum and stenopleurite indicatedcaudally but the cephalic portion obsolete. Thorax dark brown,
sparsely pruinose, the praescutum with three blackish stripes.
Halteres pale brown, the base of the stem brighter. Legs withthe elongate coxae pale, a little darker basally; femora brown;
tibiae and tarsi brownish black. Wings subhyaline, the veinsdark brown. Venation : r-m elongate but oblique; M strongly
preserved throughout its length, with macrotrichiae; cell M,
about two-thirds its petiole; vein znd, I preserved throughout
its length.

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Abdomen black, the genitalia paler, brown; dististyles black,covered with short hairs.
H abitat.-Japan (Honshiu).
Holotype, d, Mt. Minomo, Settsu-no-kuni, November L5,
1923 (C. Teranishi).
Dr. Crampton, who has studied the thoracic morphology of
the above two species ol Catocha, considers that the differences
shown in the shape of the thorax and the individual pleuralsclerites are sufficient to warrant the erection of a new genericgroup for one of them.