400 



In a recent paper* Kieffer has divided the Chirononiincc {Tcndipe- 

 dincc) into three groups, Clunioiiaricc, Ortlwcladiaricc, and Tendipe- 

 daricc, using as the principal character for their separation the pres- 

 ence or absence of the apical comb on the hind tibise, or the form of 

 that comb. I have not followed Kieffer in this respect, partly because 

 I am not satisfied with his basis for the separation, but chiefly be- 

 cause I believe that the present classification will enable students to 

 recognize the species dealt with in this paper more readily than that 

 proposed by Kieffer, with its many subdivisions. 



Key to Genera 



1. Medio-eubital cross-vein present Diamesa (p. 410). 



— Medio-cubital cross- vein absent 2 



2. Fourth tarsal joint obeordate, shorter than fifth 3 



— Fourth tarsal joint cylindrical, generally longer than fifth 5 



3. Third tarsal joint subequal in length to fourth Paraclunio\. 



— Third tarsal joint conspicuously longer than foui'th 4 



4. Wing venation normal, first and third veins not conspicuously 



thickened at apices, ending well beyond middle of wing ; male an- 

 tennae with 15 joints Tlialassomyia (p. 411). 



— Wing of female with the appearance of having a stigma, first and 



third veins conspicuously thickened on apical portion, ending 

 about wing middle ; third vein ends much in front of apex of wing 

 in male; male antemife with 13 joints. . . .CorynoneuraX (p. 413). 



5. Basal joint of fore tarsi subequal to or appreciably longer than 



fore tibia? ; apical portion of lateral arm of hypopygium not re- 

 curved, simple, without thornlike process on inner side at apex . . 6 



— Basal joint of fore tarsi not as long as fore tibiae, generally very 



much shorter ; apical portion of lateral arm of hypopygium nearly 

 always recurved and armed at apex on inner side with one or 

 more short thornlike processes 7 



6. Wings bare ; third vein rarely (suha'qualis and pseudoviridis) end- 



ing at a point farther in front of apex of wing than fourth ends 

 behind it Chironomus (p. 414) . 



*Rec. Ind. Mus., Vol. 9, 1913, p. 120. 



tThe grenus Parachinio Kieflfer was erected with iriloiatns Kieffer as the only 

 species. This species is a synonym of Telmatof/efon olasl-ensis Coquillett, the latter 

 being placed in a wrong genus by Coquillett. The synonymy will thus stand as fol- 

 lows : 



Parachinio alaskensis (Coquillett), the present paper. 



Telmaiogcton alasl-ensis Coquillett, Proc. Wash. Acad. Sci., Vol. 2, 1900, p. 395. 



Paraclunio trilolatus, Kieffer, Bull. Soc. d 'Hist. Nat. de Metz, Ser. 3, Vol. 3, 



p. 103. 

 tCorynonciira is stated by Kieffer to have 11 antenna! joints in the male. 



