AMERICAN HYMENOPTERA. 383 



on their basal middle, that on the first segment longitudinal and even, 

 that on the second transverse, angular on the sides and acutely pointed 

 behind ; the yellow posterior margin of the second segment is slightly 

 and squarely emarginate on each side anteriorly; remaining segments 

 bright lemon-yellow, the third and fourth more or less black at base ; 

 the two apical segments are tinged with orange and the third to fifth 

 segments have a transverse orange spot on each side ; beneath ferrugi- 

 nous, with a lateral yellow spot at tip, and a large semicircular black 

 mark on the base of the second segment. Length 8 J lines. 



One 9 specimen. This fine species resembles P. b-fasciatus Say, 

 but is quite distinct. 



27. Polistes Navajoe, n. sp. 



Female. — Head pale yellow, the venter, occiput and tips of mandi- 

 bles, black ; a yellow spot, confluent with the orbits, on each side be- 

 hind the ocelli ; clypeus rounded and ciliated anteriorly, sparsely punc- 

 tured and pubescent; cheeks tinged with fulvous; antennae fulvo-fer- 

 rugiuous, the middle of flagellum black; thorax velvety-black; poste- 

 rior margin of the prothorax, broader in front, tegulae and scutellum 

 ferruginous; the mesothorax has sometimes a faint reddish stain on 

 each side ; metathorax pubescent, obliquely striated, with a deep cen- 

 tral, longitudinal channel; wings fuscous, ferruginous along the costa 

 and at base, subviolaceous, nervures and stigma ferruginous ; .legs black, 

 tips of all the femora, the four anterior tibiae, basal half of the poste- 

 rior pair, and all the tarsi, tinged with fulvous ; abdomen longer than 

 the head and thorax, sericeous, the first and second segments above and 

 beneath, except apical margins, broader on the second segment, and 

 the basal margin of the third segment above and beneath, black; the 

 remainder lemon-yellow; the anterior half of the apical margin of the 

 second segment above is fulvous, shading gradually into the yellow, 

 sometimes this margin is entirely fulvous; the third and i-emaining 

 segments have a faint, central, longitudinal, fulvous streak and a lateral 

 spot of the same color, that on the third segment sometimes very dis- 

 tinct. Length 9 — 10 lines. 



Four $ specimens. This occurs also in Arizona. 



2S. Polistes flavus, n. sp. 



Female. — Lemon-yellow, base of clypeus, vertex and cheeks tinged 

 more or less with fulvous; clypeus subdepressed, subquadrate, sparsely 

 punctured, each puncture giving out a short fulvous hair, apex angu- 

 lar, ciliated, the lateral angles with two teeth, the inner one the longest; 

 tips of mandibles black; space between antennae protuberant; anten- 



