NATURAL SCIENCES OP PHILADELPHIA. 389 



Genus EXETASTES, Grav. 



1. Exetastes vittatipes, n. sp. 



9. Head white, vertex and occiput except orbits, spot beneath 

 antennae, tips of mandibles, and antennae black, scape beneath and 

 broad annulus on antennas white ; prothorax black, anterior mar- 

 gin broadly white; mesothorax black, two spots in front and one 

 on the disk, white ; base of scutellum, postscutelliun, tegulse, 

 metathorax, and pleura white, apex of scutellum, scutellar region, 

 a large bilobed mark at base of metathorax, the extreme apex, line 

 on anterior lateral suture, spot beneath tegulse, and two or three 

 small spots on side of pleura, black ; wings hyaline, nervures and 

 stigma black ; coxae, trochanters, and posterior tarsi white, 

 remainder luteous-yellow, stripe on outside of coxae and on tro- 

 chanters, stripe on all the femora above, outer side of four anterior 

 tibiae, their tarsi, and tips of posterior tarsi, black, base of the 

 latter yellow; abdomen above black, base of first segment and 

 broad apical margins of all the segments white ; venter whitish. 

 Clj'peus convex ; antennae as long as body, slender, especially at 

 tips; thorax opaque; metathorax rounded, minutely sculptured; 

 abdomen shining, tips subcompressed, ovipositor short. Length 

 5^ lines. 



Cordova. 



2. Exetastes tarsalis, n. sp. 



% 9. Differs from vittatipes only as follows: The metathorax 

 has two lunate marks at base instead of a bilobed mark ; only the 

 extreme apex of scutellum is black ; the legs are strongl^^ tinged 

 with honey-yellow, a dot on outside of intermediate coxae, a stripe 

 on posterior pair, and tips of all the tarsi, black, posterior tibiae, 

 and tarsi yellow, tips of the former dusky and of the latter black ; 

 remainder as in vittatipes. Length 4^ lines. 



Cordova. 



3. Exetastes mexicanns, n. sp. 



% . Lemon-yellow ; spot on vertex, covering ocelli, transverse 

 curved line on occiput, tips of mandibles, antennae, except scape 

 beneath and annulus on flagellum, two spots on prothorax ante- 

 riorly, its upper and lateral margins, three broad Hues on meso- 

 thorax, the medial one abbreviated behind, the others abbreviated 

 before and confluent behind, triangular mark on base of scutellum, 



