Pomona College Journal ov Entomology 451 



Head quite strongly deflexed, scarcely punctate, with eyes distinctly broader 

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

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

 i)latc-like, with the border yellowish orange in color and the discal area black ; 

 discal area (|uite plane, except the elevated pnstocellar regions; anterior 

 margin somewhat emarginate at median suture and slightly detlexed ; anterior 

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

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

 pubescent. .Vntennx inserted on frons. nut laterad ; very slender; two basal 

 segments quite slender. 



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

 briefly pubescent. I'ronotum short, depressed below dorsulum and head; 

 pleurites small. Uorsulum ascending, narrow, rather broadly rounded ce])ha- 

 lad. Metasternal spurs small and short. M'i»i^'.y small, hyaline, a little more 

 than two and a half times as long as broad, broadest across second furcal. 

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

 fourth furcal. 



Male. — .\bdomeii 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. Xason. 



Neotrioza laticeps (Crawf.) 



(Trivca Uiticcl^s Crawf.) 



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



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

 mm. ; width of vertex between eyes .38 mm. ; with eyes .62 mm. 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 

 pubescent ; quite black ; discal area plane, except elevated postocillar region ; 

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

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

 immacuUUa, slender, acute, closely appres.sed and not divergent, vertical or 

 rctrose, slightly pubescent. .Antennse inserted on frons below frontal plates 

 of vertex, in front; very slender; basal segments (|uite slender. 



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

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

 sulum ascending, narrow, quite broadly rounded cephala<l. Wini^s hyaline, 

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

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



