NATURAL SCIENCES OP PHILADELPHIA. 143 



white spot on lateral middle of second abdominal segment is 

 ovate, and that on third very minute ; the wings are tinged with 

 dusliy. Length Sf lines. 

 Orizaba ; Cordova. 



2. Polycyrtus ferox, n. sp. 



9. Black; ftice, orbits broadly interrupted behind summit of 

 ej'es, broad annulus near apex of antenna?, collar, prominent up- 

 per margin of prothorax, two short discal lines on mesothorax, 

 and oblique marginal line on each side posteriorly, and the pleura, 

 white; scutellums and metathorax marked as in melanoleucus, 

 except that the transverse of the cross is confluent with the stig- 

 matal spot and lateral stripe ; wings hyaline or subhyaline, ner- 

 vures black ; legs as in preceding species, rather darker colored 

 and with the tibise entirely yellow ; lateral and apical margins of 

 abdominal segments, white, varying in breadtii on different seg- 

 ments. Elongate, slender, smooth and shining, more slender 

 than melanoleucus ; frontal spine robust, obtuse ; metathoracic 

 spines obtuse ; areolet elongate quadrate, narrow, closed ; legs 

 and abdomen long, slender ; second segment smoothly depressed 

 before base, narrower than in preceding species. Length t lines. 



Orizaba. 



3. Polycyrtus major, n. sp. 



9. Black; head, antennre and thorax as in vielanoleucus ; 

 metathorax pale luteous, with a black central stripe dilated medi- 

 call}', crossed near base by a slender line, confluent with spot 

 covering spiracles and then with lateral stripe, basal suture nar- 

 rowl}" black ; wings hyaline, faintly tinged with fuscous, nervures 

 blackish ; legs yellow, posterior coxse with black stripe, femora 

 brownish-yellow above and within, with a blackish stripe above, 

 four anterior tarsi and apical joint of posterior pair black; first 

 three abdominal segments black above, apical and lateral margins 

 of first, second, and third segments, very broad on the latter, a 

 triangular spot on basal middle of second segment, the lateral 

 margin of which is triangularly dilated near base, white; lateral 

 margin of third segment suddenly abbreviated near base ; re- 

 maining segments white, with narrow basal margins black. 

 Smooth, shining; form much as that o^ ferox ^ with abdomen 

 rather more robust, and second segment shorter, broader and 



