134 PROCEEDINGS OF THE ACADEMY OP 



thorax posteriorly, four anterior coxre and troclianters, posterior 

 coxaj above and beneath, apical margins of all the abdominal 

 segments, a band on first segment near base above, also its sides, 

 and most of venter, all white; apical half of posterior trochanters, 

 base of their tibijE and tips of all the tarsi, dusky, posterior tarsi 

 pale yellow, sides and extreme tips of posterior coxre black ; re- 

 mainder of legs luteous; wings hyaline, slightl3' dusky at extreme 

 tips, stigma with a pale spot at base. Antennai more than half 

 the length of body, third, fourth, and fifth joints long and sub- 

 equal, the joints beyond the annulus slightly thickened ; meso- 

 thorax without distinct dorsal impressed lines, very finely and 

 closely punctured and interspersed with large scattering punc- 

 tures ; scutellura subconvex, the lateral regions crenulated ; 

 metathorax thinly clothed with white pubescence, obliquely trun- 

 cate behind, rugose, the basal third smoother, bounded behind by 

 a sharp transverse carina bent inwardly on the disk, also an ob- 

 lique sharply defined carina on each side on the verge of the 

 truncation, stigmata large, linear ; areolet of anterior wing quad- 

 rate, smaller than usual ; abdomen shining, fusiform, broad and 

 rol)ust beyond first segment, which is but slightly dilated at tip, 

 with a longitudinal medial groove above and a depression on each 

 side ; ovipositor more than half the length of the bod}-, black. 

 Length G-7j lines. 



Orizaba ; Cordova. (Sumichrast, Xo. 29.) 



2. Cryptus tantillus, n. sp. 



% l>lack ; face, mouth, orbits, cheeks, scape beneath, collar, 



tegula', line before, spot beneath, two discal spots on mesothorax, 

 scutelluras, space behind base of wings, pleura beneath and 

 laterally except anterior and posterior margins, flanks of meta- 

 thorax, two elongate marks on posterior face, four anterior coxa^ 

 and trochanters, posterior coxse except black line above, most of 

 posterior tarsi, and rather broad apical margins of abdominal 

 segments, white; wings hyaline, beautifully iridescent; posterior 

 trochanters above, apex of their tibitv and base and apex of their 

 tarsi, black. Form similar to that of lenuiventris. Length 3 

 lines. 



Cordova. A small, very slender species. 



3. Cryptus tenuiventris, n, sp. 



%. Black; face, mouth, orbits, cheeks, scape beneath, broad 



