530 CALIFORNIA ACADEMY OF SCIENCES. 



forming a sickel-shaped hook. Genital lobe rather small, 

 projecting about as far as the lamina, about as wide as 

 long, apex oblique, the acute angle anterior, the obtuse 

 angle posterior. 



Wings clear, only the faintest tinge of brown at the 

 extreme base of the hind wings. Pterostigma black, 

 membranule brown. Front wings with 11-13 antecubi- 

 tals, 6-9 postcubitals, discoidal triangle with one cross- 

 vein, internal triangle of three cells, two rows of post- 

 triangular cells, or beginning with 3 cells. No supra- 

 triangulars. Hind wings with 8-9 antecubitals, 8-10 

 postcubitals, triangle free. 



$ Differs from S as follows : trace of a bluish spot on 

 each side of 'dorsum of 6 as in preceding segments; ap- 

 pendages longer than 10, shorter than 9, simple, straight, 

 black: vulvar lamina not produced, its apical margin 

 bilobed: brownish -yellow at base of hind wings more 

 marked, reaching the median cross-vein. 



Total length 6 50.5-53, ? 50.5-51.5. Abdomen 6 36- 

 38, ? 37-38. Wing expanse S 72, § 78. Hind wing 6 

 34.5, ? 36.5-37.5. Pter. 2.25. Width of abdomen at 2: 

 5 2.6, ? 2.8-3.2; at 5: ^1.4, $1.7; at apex of 7: 63-3-6, 

 ? 2.5-3; at 10: 6 1.5, ? 2. 



Distribution. Mexico(Baja California, as above), Texas. 



The two species inendax Hag. and -prcecox Hag. are 

 very similar; according to the original descriptions the 

 differences are 



mendax prcecox 



Frout pale yellow (sometimes chalybeotis ?). fusco-Eeueoiis. 



Sides of thorax greenish-white with two oblique fuscous, three stripes, 

 approximate, fuscous stripes. the middle one in- 



terrupted, green. 

 Wings hyaline, posterior ones fulvous at ex- fusco-fumose, fulvous 



treme base. at base. 



8 postcubitals. 7 postcubitals. 



Length 55-60, alar exp. 76-86, pter. .3-3.5. Length 48, alar exp. 



70, pter. 21. 



