Pomona College Journal of Entomology 451 



Head quite strongly deflexed, scarcely punctate, with eyes distinctly l)roader 

 liian thorax. Posterior margin of thorax only slightly elevated narrowly, 

 arcuate, not eniarginate at median suture ; vertex slightly puhescent, raised 

 plate-like, with the border yellowish orange in color and the discal area black; 

 discal area quite plane, except the elevated |)ostocellar regions; anterior 

 margin somewhat eniarginate at median suture and slightly deflexed ; auteri(jr 

 ocellus at base of facial cones and lucdian suture of vertex. Facial cones long, 

 slender, closely appressed and not divergent, very acute, vertical, very sparsely 

 pubescent. AnteniKe inserted on frons, not laterad ; very slender; two basal 

 segments quite slender. 



Thorax arched, very slender and narrow, slightly punctate, sparsely and 

 briefly pubescent. Pronotum short, depressed below dorsulum and head ; 

 pleurites small. Dorsulum ascending, narrow, rather broadly rounded cepha- 

 lad. Metasternal spurs small and short. Wings small, hyaline, a little more 

 than two and a half times as long as broad, broadest across second f ureal, 

 subacute apically ; radius longer than second cubital ; second furcal shorter than 

 fourth furcal. 



Male. — Abdomen slender, not arched. Genital segment small ; ventral plate 

 not as large as anal tergite; claspers spatulate, of medium length; anal valve 

 long, extending to apical margin of ventral plate, broader at base than at tip ; 

 pubescence rather dense. 



Described from one male collected at Algonquin, Illinois, by Dr. Nason. 



Neotrioza laticeps (Cravvf.) 



{Trio::a latict'l^s Crawf.) 



(Fig. 153, B, F; 154, R; 155, O) 



Length of body 1.6 nun.; length of forewing 2.7 mm.; greatest width 1.0 

 nun. ; width of vertex between eyes .38 mm. ; with eyes .62 nun. General color 

 dark brown, thorax lighter ; head and facial cones black. 



Head strongly deflexed, with eyes distinctly broader than thorax, very 

 slightly punctate. Posterior margin of vertex only slightly elevated narrowly, 

 arcuate, not emarginate at median suture ; vertex raised plate-like, slightly 

 ])ubescent ; quite black ; discal area plane, except elevated postoccUar region ; 

 anterior margin eniarginate at median suture ; anterior ocellus at base of facial 

 cones and emargination of vertex. Facial cones long, shorter than in A'. 

 iiiiiiiaciilata, slender, acute, closely appressed and not divergent, vertical or 

 retrose, slightly pubescent. Antennre inserted on frons below frontal plates 

 of vertex, in front ; very slender ; liasal segments quite slender. 



Thorax arched, slender and narrow, punctate, briefly and sparsely pubescent. 

 Pronotum short, depressed below head and dorsulum ; pleurites normal. Dor- 

 sulum ascending, narrow, quite broadly rounded cephalad. Jl'iiigs hyaline, 

 small, slender, fully three times as long as broad, broadest across first mar- 

 ginal cell, subacute apically; radius as long as second cubital; second furcal 

 fully as long as fourth furcal. 



Female. — Abdomen slender. Genital segment almost as long as rest of 

 abdomen, very acute caudad ; dorsal plate longer and heavier than ventral; 



