108 Journal New York Entomological Society. [Vol. xvi. 



the upper discal exceeds the lower considerably, the petiole of lanceolale cell is rather 

 longer than usual ; fore wings wanting. Claws deeply and evenly notched. Sheath 

 broad, obtusely pointed ; cerci stout, rather short. Color reddish yellow ; antennae, 

 eyes, large spot from base of antennas above to occiput, mesonotmn, scutellum, meta- 

 notum, basal plates, abdomen above, not so widely at the apex, sheath, hind tibiae 

 and tarsi, small spot under tegulae, two small spots on meso-pectus black ; four ante- 

 rior tarsi somewhat infuscated. Wings hyaline, nervures brown. 



Habitat. — Trinidad, Colo., May 14, 1892 (C. P. Gillette), 

 "general collecting." Type in collection of Colorado Agricultural 

 College. 



This species was labeled " Enura s-nodus Walsh,' 1 '' which it is 

 not. If it is an Enura it can be known from E. s-nodus by black pos- 

 terior tibiae and tarsi. Although the fore wings are not present I feel 

 sure it is a Pteronus. It may be separated by the following character 

 from its allies. 



1. Clypeus broadly, circularly emarginate 2 



Clypeus angularly emarginate 3 



2. Frontal crest broken by a narrow line ; hind femora at apex resinous 



comelli Marl. 

 Frontal crest unbroken ; hind femora at apex black ostrycs Marl. 



3. Ocellar basin triangular; no black on pectus odoratus Dyar. 



Ocellar basin quadrate, sides sub-parallel ; two black spots on pectus 



solitarins, new species. 

 8. Pachynematus robustiformis, new species. 



Female. — Length 6 mm. ; length of anterior wing 6 mm. Robust. Head a 

 little wider behind compound eyes, rather closely punctured; ocellar basin broad, 

 walls linear, not well defined above ; lower wall broader and rounded ; middle fovea 

 circular, rather large, deep ; frontal crest very slightly broken ; antennal fovea; rather 

 large, sloping ; clypeus shallowly, circularly emarginate ; antennal joints thtee, four 

 and five subequal. Intercostal vein its length basal to basal ; stigma broad, rounded, 

 widest across the middle. Inner tooth of claw small, a little basal to middle. Sheath 

 broad, upper margin straight, lower margin tapering, apex truncate ; cerci short, 

 robust. Color black; labrum, mandibles (apex rufo-piceous), posterior angles of 

 pronotum, tegulas, extreme apices of coxae, trochanters, four anterior femora, tibiae and. 

 tarsi, posterior tibiae except apex pallid ; posterior femora brownish ; bases of four 

 anterior tibiae infuscated ; tip of posterior tibiae and tarsi black ; venter of abdomen 

 more or less luteous. Wings hyaline, iridescent; nervures, costa and stigma brown. 



Habitat. — Sierra Blanca, Costilla Co., Colo., 10,000-11,500 ft., 

 June 22, 1907 (L. Bruner) ; also Ute Creek, Costilla Co., Colo., 

 9,000 ft., July 24, 1907 (H. S. Smith). 



This species falls next to robustus Marl. It may be known from 

 that species by the stigma being widest in the middle, the different 

 position of the intercostal nervure, the short cerci, etc. The head 



