526 



Originally described from New York. A species recorded from 

 Gallinas River, Las \>gas, N. M., by Johannsen, is stated to differ in 

 size — both larva and imago — from nivoriundiis, and Johannsen sug- 

 gests that it may be a distinct species. 



The larval labium figured for this species by Johannsen does not 

 agree with that of the larvae I reared, as will be seen by comparison of 

 his figure with mine, but the pupa agrees entirely with the description 

 given by him. One pupal specimen differs from the typical form in 

 having the thoracic respiratory organs as in Figure 2, Plate 

 XXXVIII, and the eighth abdominal segment as in Figure 4. This 

 may be a distinct species, but I have reared only one female specimen 

 and can find no good character for separating it from the female of 

 nivoriundiis. 



Dactylocladius Kieffer 



This division, or subgenus, includes species which are distin- 

 guished from Orthocladius by the presence of linear empodia. It is 

 seldom that the empodium is indistinguishable under a high-power 

 lens, but it is very small. In the species which I have referred to 

 Dactylodadius the empodium is longer than the claws. There are in 

 hrevinervis other differences in structure which might be considered as 

 of equal value for the separation of at least the males of the two spe- 

 cies here dealt with, but the generic characters of Dactylodadius have 

 not been indicated sufficiently by Kieffer, and as the type species may 

 possess the characters of either hrcz*inervis or plcuralis I am unable to 

 utilize them in limiting the group. 



Key to Species 



1. Third vein ending noticeably proximad of apex of anterior branch 



of cubitus; second vein indistinguishable 1. hrevinervis. 



— Third vein ending distad of apex of anterior branch of cubitus or 



very little proximad of it ; second vein distinct 2 



2. YelloAv species, general color of thorax pale yellow, contrasting 



markedly with the blackish vittse 2. pleuralis. 



— Black species, ground color of thorax blackish. .3. alhidolialteralis. 



I. Dactylocladius brevixervis, n. sp. 



Male. — Black, shining. Head yellowish, antennae and palpi fus- 

 cous. Mesonotum distinctly shining, spaces between the vittae ochre- 

 ous ; pleurae dull yellow ; scutellum obscurely yellowish ; postnotum 

 black. Abdomen black, without pale markings. Legs obscurely yel- 

 lowish, fore femora slightly brownish. Wings clear, veins very pale. 

 Halteres yellow. 



