440 Pomona College Journal of Entomology 



posterior margin on each side of the median suture. Facial cones large, long, 

 subacute, quite strongly divergent, intermediate between vertical and horizontal, 

 easily visible from above, sparsely pubescent. Antennae inserted on frons at 

 base of facial cones laterad. Eyes large, prominent. Labrum medium in size. 



Thorax arched strongly, coarsely punctate. Pronotum moderately long, 

 arched and strongly descending cephalad, depressed below head and more 

 or less below dorsulum ; propleurites narrow. Dorsulum moOcrateijr long, 

 ascending to scutum. Metasternal spurs medium. IVings subhyaline, slightly 

 dusky, covered over entire membrane with fine punctural dots ; all veins m>. 

 with a double row of minute setae ; less than two and one-half times as 

 long as broad, broadest across base of first marginal cell, broadly rounded 

 apically ; marginal cells subequal ; second furcal quite strongly arched ; vena- 

 tion prominent. 



Male. — Abdomen more slender and smaller than in female. Genital seg- 

 ment large, rounded ; claspers long, only slightly tapering, abruptly broadened 

 at tip; anal valve very large, long; straight on anterioi margin, lobately 

 arched on posterior margin; with a small capitate lobe projecting caudad 

 and dorsad ; posterior margin with a conspicuous fringe. Pubescence sparse 

 and brief. Female. — Abdomen stout. Genital segment large, not quite as long 

 as rest of abdomen ; dorsal plate longer than ventral ; both plates acute, slightly 

 serrate apically ; genital pore fully one-fourth as long as dorsal plate ; ovi- 

 positor quite long, not acutely pointed. Pubescence .sparse and brief. 



Described from four males and numerous females, collected in the mountains 

 near Cuernavaca, Mexico (altitude 10,000 feet), by D. L. Crawford. Food 

 plant : Rhus sp. 



Trioza mexicana minuta n. var. 



Body distinctly smaller than in the species. Head quite similar to species ; 

 pronotum comparatively shorter and more depressed ; wings smaller, less dusky ; 

 setae on veins less prominent, although present ; venational characters similar. 

 Genitalia very similar to species ; male genitalia comparatively smaller. 



Described from three females and one male collected at Oa.xaca, Alex., by 

 D. L. Crawford. 



Rhinopsylla Riley 



This genus was erected for the single species Sclrwarcii, in 1883. While this 

 species possesses characteristics which evidently separate it generically, still 

 the description of the genus was made so restrictive by Riley that closely 

 related species could not be included in a generic group with this species. 

 The following description of the genus is more general and only characters 

 are mentioned which belong to the entire Rhinopsylla group of species, rather 

 than to the single species described by Riley. 



Body moderately slender, slightly arched dorsally. punctate. Head, including 

 eyes, as broad or broader than thorax. Vertex very deeply and triangularl\ 

 emarginate anteriorly at median suture, giving a very marked birostrate 

 appearance. Antenna* attached to apex of rostra, greatly increasing the 



