NATURAL SCIENCES OF PHILADELPHIA. 135 



aiinulus on flagellnm, collar, teguloe, liue before, dot beneath, 

 elongate spot on disk of mesothorax, scutelhim, space behind base 

 of wings, flanks of metathorax, two spots at base and two at 

 apex, pleura, base of four anterior legs, base of first abdominal 

 segment, and broad apical margins of all the segments, white ; 

 wings hyaline, iridescent ; legs, especially posterior pair, more or 

 less 3'ellow, posterior tarsi whitish, two stripes on posterior coxte 

 and all the femora aboA^e fuscous. Yery slender, head broader 

 than usual; metathorax rounded, with two transverse subarcuate 

 carinse and no tubercles or spines ; areolet 5-angular ; abdomen 

 slender, gradually' dilated at apex. Length 4j lines. 

 Orizaba. Also a very slender species. 



4. Cryptus Celaya, n. sp. 



9 . Head black ; face, mouth, cheeks and orbits white ; antennte 

 black, with scape beneath and broad annulus on flagellum white ; 

 thorax white, tinged with yellowish : band on prothorax, meso- 

 thorax except central elongate spot, space around scutellums, base 

 of metathorax, a broad central stripe and a slender one down 

 each side, black; wings h3'aline, nervures pale; legs dull luteous, 

 pale at base, dot on intermediate coxre and stripe on posterior 

 pair black, four anterior tarsi dusky, posterior pair white, black 

 at extreme tips ; abdomen black with a broad white band on 

 second and following segments above, base of second segment 

 white, first segment white with a black spot before apex. Form 

 rather small, slender ; head not buccate, eyes large and prominent ; 

 antemiffi long, slender, porrect ; scutellum subconvex, metathorax 

 sloping behind, the lateral tubercles small and obtuse ; areolet 

 subtriangular, small ; legs slender ; abdomen shining, first seg- 

 ment polished, apex subquadrate, slightly dilated ; ovipositor half 

 the length of abdomen. Length 4^ lines. 



Mirador. The metathorax has a broad black band at base, an- 

 other down the middle and a slender one on each side. 



5. Cryptus arcuatus, n. sp. 



9 . White ; space beneath e^'es, base and tips of mandibles, 

 middle of vertex covering ocelli and extending to occiput, disk 

 and lateral margins of prothorax, mesothorax except round discal 

 spot, scutellar region, arcuate band on metathorax broad on disk, 

 spot at apex, a slender oblique line beneath posterior wing, and a 

 spot on outside of all the coxa?, larger and cuneiform ou posterior 



