NATURAL SCIENCES OF PHILADELPHIA. 13t 



above ; wings hyaline, iridescent, nervnres brown, areolet 5-angu- 

 lar, rather small; legs honey-yellow, coxte j^ellowish-white more 

 or less tinged with honej'-yellow, posterior pair with dnsky spot on 

 outer side, tips of posterior tibiae and of all the tarsi black, pos- 

 terior tarsi white, base and apex black ; abdomen slender at base, 

 shining black, apical margins of all the segments broadl}' white, 

 lateral margins narrowly so, basal half of first segment honey- 

 yellow. Length 4^ lines. 



Cordova. This pretty species is easily recognized by the angu- 

 lar black mark on disk of metathorax. 



8. Cryptus citus, n. sp. 



9 . Head white, vertex and occiput except orbits, black ; an- 

 tennre black, scape beneath and broad annulns on flagellum, white; 

 collar and prothorax white, the latter with a central black stripe ; 

 mesothorax black, with a central white spot ; scutellum white, the 

 lateral region black ; tegulre and short line beneath white ; meta- 

 thorax honey-yellow, basal suture and median triangular stain, 

 black; flanks of metathorax, and pleura whitish ; wings hj'aline, 

 nervures and stigma blackish ; legs honej'-yellow, tips of all the 

 tarsi, tips of posterior tibial and extreme base of their tarsi, black- 

 ish ; remainder of posterior tarsi white ; abdomen entirely honey- 

 yellow ; ovipositor black. Form slender ; antennse rather longer 

 than body, filiform ; metathorax rugulose, obliquely truncate be- 

 hind, with a shoi't, transverse, sharply defined carina on each side 

 and a subarcuate indistinct carina between middle and base ; areo- 

 let 5-angular, not large ; legs slender ; abdomen slender, smooth, 

 somewhat shining; ovipositor longer than first abdominal seg- 

 ment. Length 4^ lines. 



Orizaba. Allied to atricollaris, Walsh. 



9. Cryptus pulchripennis, n. sp. 



9. Uniformly ferruginous, slender; narrow anterior and pos- 

 terior orbits yellowish-white; antennae long, slender, black, with 

 a broad pale j'Cllowish annulus about the middle, base ferrugin- 

 ous ; disk of prothorax yellowish-white ; anterior and posterior 

 suture of pleura, space around scutellum, and spot on each side 

 of metathorax at extreme tip, l)lack ; metathorax rounded, with 

 two fine transverse subarcuate cariufe, between which the space 

 is obliquel}- finely aciculate, apex longitudinally striated ; wings 

 pale yellowish-hyaline, beautifully iridescent, a band beneath base 

 10 



