68 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.52. 



with black; the trochanters and proximal ends of the femora are 

 more or less suffused with ferruginous. The wings are very slightly 

 infumated. 



Male. — Black: Labrum, mandibles except apices, clypeus, spot 

 between antennae, scape except spot above, basal segments of 

 flagellum more or less, broad anterior orbits, narrow posterior orbits, 

 posterior margin of pronotum broadly including tubercles, tegulae, 

 lateral borders of scutum, pair of discal marks on same rarely absent, 

 large lateral spots on scutellum, narrowly connected in one specimen, 

 metanotum, curved fascia on dorsum of median segment more or less 

 broken, lateral angles of medium segment, one or more spots on 

 mesopleurae, fasciae on tergites 1-6 broad, narrowly interrupted 

 medially, the first narrowed somewhat medially, fasciae on sternites 

 continuous but greatly narrowed medially, spot on all coxae, re- 

 mainder of legs except more or less of trochanters and base of femora, 

 bright yellow. The wings are but slightly infumated, less so than in 

 the case of capnoptera. The flagellum is somewhat ferruginous and 

 without conspicuous modifications, although segments 4-11 bear 

 specialized areas similar to those of capnoptera. The intermediate 

 femora and the genital stipes are likewise similar to those of capnotera. 



Length. — 14-16 mm. 



This species stands close to capnoptera Handlisch, but differs from 

 it in the presence of mesopleural markings, greater clearness of the 

 wings and the better development of the abdominal fasciae. On the 

 type (male) of the species the abdominal fasciae are broad and con- 

 tinuous, really forming continuous rings around the body, hence the 

 name, annulata. On the allotype (female) all the dorsal fasciae are 

 interrupted except the sixth. The ultimate tergite of the female bears 

 a pair of well marked lateral ridges inclosing a pygidial area slightly 

 rugose basally and sparingly punctate elsewhere. The lateral areas 

 bear short scattered spines or bristles. The ultimate sternite through- 

 out its apical half extends out laterally beyond the tergite as shown 

 in figure 137. On the type the lateral areas of the ultimate tergite 

 and the corresponding sternite are yellow, but in some specimens the 

 ultimate segment is black both above and below, while in others the 

 proportions of black and yellow vary. 



Habitat. — Arizona, New Mexico, Texas. 



Number of specimens examined — Males 4; females, 13. 



Type. — Female in the collection of University of Kansas, Paratype, 

 Cat. No. 19678, U.S.N.M. 



BICYRTES GRACILIS, new species. 

 Fig. 123. 



Male. — Black: Clypeus except narrow apical border, mandibles 

 except tips, crescent shaped spot on frons below antennae, scape 



