MORGAN HEBARD 195 



convex, not showing weak but distinct longitudinal carinae on 

 each side. Eighth tergite with lateral (ventral) margins very 

 faintly convex, almost straight; not very broadly but distinctly 

 convex. Ninth (ultimate) tergite with surface weakly convex, 

 with a fine niedio-longitudinal carina, distad rounded and sub- 

 bilobate; not truncate, the distal extremity weakly bracket- 

 shaped emarginate with latero-caudal angles deflexed, briefly 

 produced, with apices rounded as in jaliscensis. Subgenital 

 opercle deeper, surface more evenly convex, similarly produced 

 ventro-caudad in an acutc-angulate projection which is pro- 

 ])ortionately smaller but shows considerable size variation in 

 the series. 



The majority of the females are grayish, the males being 

 darker, often brown with the sides of the head conspicuously 

 white ventrad. 



Length of body, d" 99 to 131.3, 9 142 to 187; length of meso- 

 notum, cP 33 to 35.2, 9 35.7 to 48; length of metanotum (in- 

 cluding median segment), cf 20.3 to 24.2, 9 27.7 to 29.9; length 

 of median segment, cP 9.1 to 11.3, 9 10.2 to 12.8; length of 

 cephalic femur, d" 33.3 to 37.3, 9 30.5 to 40.2; length of caudal 

 femur, d 33.1 to 38, 9 32.8 to 40.7; length of operculum, 24 

 to 29.7 mm. 



Explanation of Plates 



Plate VI 



All of the specimens figured in the present paper are from Venvidio, Sinaloa, 

 Mexico. 



Fig. 1. — Prosparatia sinalonc new species. Male. Type. Dorsal view of 

 pygidium and forceps. (X 9) 



Fig. 2. — Prosparatta siiialoae new species. Male. Type. Dorsal view of 

 pygidium. (Greatly enlarged.) 



Fig. 3. — Prospardtta sinaloae new species. Female. Allotype. Dorsal view 

 of liygidium and forceps. (X 9) 



Fig. 4. — Euihlastoblutta grata new species. Male. Type. Ventral view of 

 subgenital jilate. (Much enlarged.) 



Fig. 5. — Neoblaitella sinaloae new species. Male. Type. Dorsal view of 

 pronotum. (X 6H) 



Fig. 6. — Neoblaitella sinaloae new sjjecies. Male. Type. Ventral view of 

 subgenital plate. (Same scale as figure 4.) 



Fig. 7. — Isehnoptera bicormda new sjjccies. Male. Type. Dorsal view 

 of pronotum. (X Gj^) 



TUANS. AM. ENT. SOC, XLVIII. 



