HENRY J. FRANKLIN. 145 



conspicuous. Inner spatha much like that of fervidus (fig. 101), but 

 with sides of apical portion outcurved. Claspers (fig. 175 and fig. 188) 

 appearing moderately short ; with branches rather narrow and evenly 

 rounded at distal end as seen from dorsal side ; volsellae reaching con- 

 siderably beyond tips of sagittae and squamae, their apices but slightly 

 rounded, appearing almost squarely truncate, and the middle of the 

 inner side of each protruding inward, toward the middle line of the 

 body, in a single broadly rounded projection ; squamae with outer lobe 

 much larger than inner one and narrowing rapidly towards its nar- 

 rowly rounded apex, the inner lobe not reaching, or scarcely reaching, 

 mesad beyond the inner margin of the volsella. Sagittae with shafts 

 bent outward somewhat in the middle and with heads irregularly folia- 

 ceous-sickle shaped, the base of the sickle being very broad and the 

 apex pointed. Uncus broad and tapering rather rapidly towards its 

 distal end, the recurved tip being rounded and so depressed longitu- 

 dinally in the middle as to appear channelled. 



Wittgs. — Rather dark. 



Legs. — Dark and with dark pile. Hind tibiag with slightly convex 

 outer faces, these faces being mostly bare, but with a few scattering 

 hairs; the front fringe of these tibiae short, but the hind fringe (of 

 hairs) rather long. Hind metatarsi about three and one-half times as 

 long as their greatest width ; their hind fringes long and black ; their 

 outer faces nearly flat. 



Dimensions . — Judging from the fact that this species has been long 

 confused with B. dolichocephalus and that Handlirsch did not give 

 measurements for it, it seems not improbable that the females of this 

 species are, on the average, of about the same size as are those of B . 

 dolichocephalus. If this is the case, the queens of this species are 

 twenty or more millimeters in length. I have here described the male 

 from two specimens, the measurements of which are as follows: 

 Length, 12 mm. to 13 mm. ; spread of wings, 30 mm. to 33 mm. ; 

 width of abdomen at second segment, 7 mm. to 7| mm. 



Habitat. — We have no record of this species outside of 

 Mexico. My two males were both collected at Orizaba, 

 Mexico. B. diligens of Smith came from Oajaca, Mexico. 



While I have not been able to study this species, in com- 

 parison with others, sufficiently to get a very certain idea of 

 its relationships, it seems to me, from my somewhat super- 

 ficial study, that crotchii and haueri are its closest allies. 



It is impossible to tell by the original description whether 

 Smith's diligens was this species or the form to which Hand- 

 lirsch gave the name dolichocephalus. Smith's type is prob- 

 ably still in the British Museum. Col. C. T. Bingham 



TRANS. AM. ENT. SOC. , XXXIX. (19) 



