144 PROCEEDINGS OF THE ACADEMY OF 



scarcely depressed near base ; frontal spine subacute, as are also 

 the metathoracic spines. Length 8^ lines. 

 Orizaba. 



4. Polycyrtus acerbus, n. sp. 



$. Black; head, antennae, thorax, and legs marked as in 

 major; posterior tarsi white, with base yellow and claws black; 

 wings hyaline, nervures brown ; first segment of abdomen white, 

 with a narrow central black line above, interrupted near base and 

 broadly dilated near apex ; second and following segments black, 

 with broad apical and lateral white margins ; second segment with 

 sublunate white spot on each side and the third with small white 

 spot on lateral middle. Form slender; head, thorax and abdomen 

 smooth and shining, metathorax rugose, opaque ; frontal spine 

 short and obtuse ; metathoracic spines flat ; abdomen robust be- 

 yond first segment ; areolet small, quadrate, closed. Length 6 

 lines. 



Orizaba. Closely resembles melanoleiicus, but easily distin- 

 guished by the markings and sculpture of the metathorax. 



5. Polycyrtus macer, n. sp. 



% 9. Head, antennje, prothorax, and mesothorax black ; face, 

 mouth, orbits, broad annulus on antennae, collar and spot on each 

 side before tegular, two oblique lines before scutellum, tegultie, 

 apex of scutellum and postscutellum, with slender lines leading 

 to base of wings, and spot beneath tegulre, white ; pleura and 

 metathorax tinged with 3'ellowish, anterior margin of pleura, ex- 

 tending beneath, l)asal suture of metathorax, a broad central 

 stripe and a slender one on each side, the former crossed by a 

 short slender line ; black ; wings hyaline, faintly dusk}' on apical 

 margin, nervures black; legs dull luteous, trochanters and femora 

 more or less tinged with fuscous, tibiae yellow, four anterior tarsi 

 blackish, posterior pair white, with black claws; abdomen black 

 above, first segment white, with a subapical black spot, remaining 

 segments with rather broad apical, and uneven lateral white mar- 

 gins, the second with a long acute mark at base, sometimes cruci- 

 form. Long and slender, rather smooth and shining, pubescent ; 

 frontal horn ver}- short and acute; metathoracic spines short 

 and obtuse, antennre as long as body ; areolet minute, closed ; 

 abdomen long, slender, subcj'lindrical in %. Length G lines. 



Cordova. (Suniiclirast, Xo. 100.) 



