/77[Reprinted from lnsecutorInscitieeMenstruus,Vol, X[TWONoe.7-9, 1924]

UNDESCRIBED SPECIES OF TANYDERUS
FROM THE AUSTRALASIAN REGION(Diptera, Tanyileridoe)
Bv CHARLES P, ALEXANDER

The two new speciesof. Tanyderus discussedherein both belong to the subgenusRad,inod,erusHandlirsch, a division of thegenus that includes the Chilian Tanyd,eru.rgloriosus Alexander
and the three previously described Australasian specieskeyeri
below. The subgenusRad,inoderu.rwas erected by Handlirsch
in 1909 (Ann. Naturhist. Hofmus. Wien, 23, 264) to receivethe single species,ornatissi,mus(Doleschall). The Australasianspeciesof the subgenusmay be keyed as follotvs:
1. Legs,includingthe tarsi,yellow,the kneesbrownto black........ z
h l a c k th, e { e mo rabl a ses
pal er........... . 4
Legsbr ownt o b ro w n i s b
2. Wing-patternin part ocelliform,this includinga conspicuous
ringwith the fork of Rr* s as a center(New Guinea),ocrrla.frsRiedel
W ing- pat t e rn
n o t o c e l l i fo rm...... 3
3. Antennae22-segmented(Amboina,Qbi) .. .ornatissimrs(Doleschall)(South Queensland),.
Antennae24-segmented
4. Mesonotumwith threebrownstripes,,n" rtJj::ft:{X:"iTltt::f:
no palering on fore tibia (SolomonIslands),
toT*j
Mesonotumwith rour ill-defined b.own st.ip:l'?rlfi,.1rt:with grayish white; an ill-definedpale ring on the fore tibia(New Guinea)... . .mirabil,isde Meijere
Tanyderus(Radinoderus)

terra-regilu!,

new species.

Ser?-ler,gth(excluding genitalia) about 24 mm.; wing
18.5 mm.
Rostrum and palpi black. Antennal scape black, the flagellum conspicuously light yellow throughout; antennae ?4-segmented, the basal flagellar segments short-cylindrical, gradually increasing in length, the terminal segment about onethird the length of the penultimate and slender. Eyes practically contiguous above,the vertex being reduced to a capillary
strip that is a little wider behind, light gray, the posterior vertex
with a median brown line.

r42

INSECUTOR INSCITI.4]

M4NSTRUUS

Cervical sclerites elongate, about as long as the head, dark
Pronotum dark brown medially, paler laterally.
brown.
Mesonotum pale brown, with three darker brown stripes, theinterspaces passing into gray behind, the transverse suture indicated laterally; scutellum yellow, the caudal margin and amedian line dark brown; postnotum brown, the cephalic-laterai
angles yellowish. Pleura dark brown, with a large pale areathat includes portions of the anepisternum, sternopleurite andthe cephalic margin of the pteropleurite. Halteres yellow, theknobs dark brown.
Legs with the coxae infuscated, thetrochanters brighter brown; femora bright yellow with thetips broadly and conspicuously blackened, the tibiae likewise
yellow, the bases blackened, the amount equal to the femoral
apices; tips of the tibiae barely darkened; tarsi yellow. Wings
whitish subhyaline, with a handsome brown cross-banded pattern as in the genus; the band along the cord very oblique, Yshaped, the subterminal band along the level of the outer endof cell rs| Mz being more transverse, the white band lying between narrow at cephalic end, widening posteriorly, the wholeouter end of cell Cq virtually devoid of dark markings except
the extreme distal corner; basal brown band heavy, connectingwith the band at the cord only by a narrow seam along vein
Cu; band along cord and subterminal band connected with one
another only in cell R1 ; apical band solid, connected with thesubterminal band in cells Ra and Ru. Venation : cell rst M',
elongate, about twice the length of vein M3 beyond it; m-cu
present;branches ol Cu widely divergent, cell Cur at margin
being fully four times as wide as cell Ma.
Abdominal tergites dark brown, each segment with an oval
whitish mark on either side; sternites dark brown, sparsely
variegated with small yellowish areas. Genital segment broken.
H abitat.-Soath Queensland.
Holotype, Sex?-Brisbane, the type bearing the label "10-10,J. A. K.," possibly collected by Kusche.
Type in the collection of the National Museum, Melbourne,Victoria.

INSECUTOR INSCITI,{MDNSTRUUS

7+3

Tanyderus (Radinoderus) solomonis, new species.
Female.-Length about 14 rnm.; wing 12 mm.
Closely related to 7. (R.) mirabilis de Meijere (NewGuinea), differing as follows:
Size smaller. Vertex between the eyes reduced to a capillary strip. Mesonotal praescutum and scutum with only threedark brown stripes, the median stripe quite undivided; scutellum greyish yellow, the caudal margin narrowly dark brown.
Pleura brown, sparsely variegated with paler, not pruinose.
Legs brown, the femoral bases broadly yellowish; no evident
pale ring on fore tibia. Abdominal sterni,tes with whitish
comma-shaped marks, almost as on tergites.
H abitat.-Solornon Islands.
Holotype,9, Guadalcanar Island, January 17-18, 1921 (J. A.
Kusche).
Type in the collection of the Bishop Museum, Honolulu.