44+Vol. IX,Noe.tl-6. 19211[ReprintedfromlnsecutorInscitie Menstruus,
T\MO UNDESCRTBED SPECTES OF JAPANESEPTYCHOPTERIDAE(Diltera)
Bv CHARLES P. ALEXANDER
Two species of the genus Ptychoptero Meigen have hitherto
been recorded from Japan. It is with pleasure that two additional forms are herewith made known, both from the islandof Hokkaido.
The material was included in a collection ofJapanese Tipuloidea sent to me for naming by Dt. Shiraki, towhom I express my thanks for this and other valuable specimens from the Japanese Bmpire. The types are preserved in
the writer's collection, additional material in the possessionof
Dr. Shiraki.
Ptychoptera

daimio, new species.
General coloration yellow, mesonotal praescutum with threebroad, shiny black stripes; basal antennal segment yellow;
tarsi dark brown; wings with a strong yellowish tinge, brown
wing-markings very restricted; lateral lobes of the ninth tergiteof the male hypopygium bifid.
Male.-Length, 10.5 mm.1 wing, 12.3 mm.
Rostrum and front obscure yellow; palpi yellow, the terminal segment dark brown. Antennre with the first scapalsegment light yellow; second scapal segment brown; flagellum
black. Head black.

INSECUTORINSCITIE MDNSTRUUS

81

Mesonotal praescutum yellow
Pronotum obscure yellow'that are nearly confluent'
with three broad, shiny black stripes
onto the scutal lobes;
the lateral stripes continued t"od"dsparsely gray pubescent'scutellum yellow; postnotum black,dorso-pleural memclari, with . firr. gruy pubescence;il;;;yellowish brown' Legs withbranes obscure yellow- fr"titttt
whitish pubescent;. femora
the coxr and trochanters yellow,brown; anterior Iace
brownish yellow, tfre iips broadly darkface; tibia brownishof f emora slightly au'tti' than posterior
Wings with abrown'
darktarsi
d* Uis aart brown;;b*;wingtinge, the costal cell more saturated;
il;a'yellowish
seams
brown
larrow
asvery restricted, appearing;;;;idt
forks of R'*o and;. co.i, at the tip'"f Rr *9 at the;i;;;inthe bases of thelacking
M; mactotrichie on *i"g-su'f "cestraight ;VenatioJ: Rs comparatively short'p.irr.ipuf ..ffr.
fork'its,-* ,onn .ted with Rs shortly before
with a broad
Abdominal tergites obscure orange-yellow'
at the posinterrupted
median black stripe that is narrowly
sternites
blackish;hypopygilm
terior margins o{ the segments;
inarposterior
thesternites 6 and ? black with;;;;g"-y"ftw,
theof
regionthewithgins broadly yellorv' Male hypopygium
lobe
hairy
oval
a small'
ninth tergite profoundly "ottnta, withthe tergal lobes
ofendsthenotch,
the-pale'at the base ofsternite producedof thel""pfy Una. Cuoa"i *u'gl".eighth
median lobe' immediately dorsad
into a short, broad t""ttutld
are densely covered withof which lie two small lobes that
long, erect, silverY seta'
Habitat'*laPan.
14' 1916
ffoio,rp", Late, T"st'io, Northern Hokkaido' July
(T. Isshiki). Shiraki No' 6988'
the present specles ls
The general appearance and size ofof Europe'
somewh-atas in P. atbimana (Fabr')
Ptychoptera

subscutellaris,

new species'differing in theRelated to P. scutelloris Meigen (Europe),
structure oI the male hYPoPYgium'mm'Male.-Lenglh about 9 mm'; wing' 9'282

rNSEcuToR

rNscrTrd

MDNSTRUUS

Rostrum dark; palpi obscure yellow, darker toward thetip.
.
Antenna with the first segment dark brown; second ,"g*ant
dark brown with the apicai half obscure yellow; flagellum
black. Head black.
Mesonotum shiny blue-black, only the median lobe of thescutellum obscure yellow. pleura dark, gray pruinose;
dorso_
pleural membrane pale yellowish brown. Halieres yeliow,
theknobs yellowish brown. Legs with the coxa and trochantersobscure yellow; femora and tibia yellow, the tips narrowly
dark brown; tarsi broken. Wings with a grayish
yellowtinge, the costal and subcostal cells clearer yellow;
very small
and indistinct brown crouds at r; arong the cord ani
outer
end of cell rs/ Mr; veins brown. Venation: Rs spurredat theangle.
Abdomen blue-black, the caudal margins of the tergites
very
narrowly pale. Male hypopygrum differing fromthat oiP. scutellaris in the following points: Ninth pleurite
with theappendage elongate, near midlength with a conspicuous
trian_
gular blade borne on a moderately long pedicel;
apex of theappendage beyond this lateral lobe dilated into a long,clavatelobe that is provided with abundant, long, dense halrs;
baseof the appendage triangular, heavily blackined, bearing
severalstiff sete, the inner face projecting into a spinewith"a groupof about nine subequal, powerful, black spinules
at itslase.
In P. scutellaris, the appendage is slender with asmall. neartv
sessile, feebly triangular lobe close to the tip; baseof theappendage not conspicuously blackened, with a powerfulspinebearing about two or three smaller spinules along
the _"rgin;
two or three similar spinules are scattered over thebase of theappendage.
Habitat.-!apan.
Holotype, male, Sapporo, Hokkaido, AugustZg, 1g0g (T.
Shiraki). Shiraki No. 69?8.
This species was described by Matsumura (Thous.
Ins.
Japan, Add. Z, pp. 478, 474, tg16) as ptychopte)a scutellaris,supposed new species. The name is alread.y in
use for on" ofthe common European species of the genus.
The writer

.rNsEcrtlon rNscrfr.4

t&NsrNirts

88(Journ. N. Y. Ent. Soc., vol. 28,p. 61,1918) has pointed out
this fact and expressed the possibilrty of the Japoese insectbeing the sarne as the Eumpean form. A study of authentic
specimensof both speciessoon revealed the difrerences above
descnlbedand the speciesis co'nsequentlyrenamed as above.