AMERICAN HYMENOPTERA. 257 



Shining blue-black, the pubescence entirely black, female; on cheeks, front, 

 occiput and thoracic dorsum dull white, male Foxii Ckll. 



231. Females 232. 



Males 237. 



232. Head and thorax black. The abdomen rufous or reddish 233. 



Entire insect black ... -234. 



233. Abdomen ferruginous, with faint indications of apical hair bands on seg- 



ments 2-4. Flies in spring. . . a ndreuoides form bieolor Rob. 

 Abdomen mostly orange rufous, practically naked above, except on the apex 

 which is strongly fringed with pale ochraceous hairs. Flies in fall. 



pectidi** Ckll. 



234. Pubescence throughout black phoiiax Ckll. 



Pubescence pale, or at most only a few black hairs intermingled with the 



prevailing light colored ones 235. 



235. Hind margins of abdominal segments furnished with uniform bands of 



dense, appressed white pubescence, the adjacent bases of the following 

 segments with similar but thinner and narrower bands. 



rhodoeerata Ckll. 



Hind border of abdominal segments with less conspicuous light hair 



bands 236. 



236. Smaller (8-9 mm.); the metathorax rather minutely granular; the wings 



yellowish fuliginous aiidrenoides Cress. 



Larger (9-10 mm.); the metathorax more rugose, and the wings clearer 

 than the preceding wellesleyana Ckll. 



237. Provided with yellow face marks 238. 



Face wholly black 241. 



238. Clypeus, together with a portion of face, yellowish 239. 



Clypeus alone yellow (7 mm.) eoiieiuiiiila ( kll. 



239. Clothed on head and thorax with rather long whitish pubescence, that on 



abdomen short and sub-erect 240. 



Clothed on head and thorax with fulvous-yellow pubescence (7J mm.). 



n«'\ adensis Cress. 



240. Clypeus somewhat bulging, smaller (8J mm.) aiidrenoides Cress. 



Clypeus more flattened, larger (9 mm.) wellesleynua Rob. 



241. Abdomen furnished with hair bands 242. 



Abdomen without hair bands 244 



242. The head wider than the thorax, face narrowing below, flagellum rufous 



below 243. 



Head not wider than the thorax. Ahdonien clothed with short sub-erect 

 pale pubescence mixed with black, apical margin of each segment 

 with a regular narrow fascise of dense white pubescence (10 mm.). 



regularis Cress. 



243. Larger (8-9 mm.) ; tarsi ferruginous, the wings sligtly dusky toward apex. 



rhodoeerata Ckll. 



Smaller (7-7^ mm.) ; legs wholly black, wings with the apex dusky hyaline 



and slightly milky olivia* Ckll. 



244. Smaller (64 mm.) ; wings hyaline, slightly dusky at tips. 



nigrifrons Cress. 

 Larger (8 mm.) ; wings perfectly clear eiioelli Ckll. 



TRANS. AM. KNT. SOC., XXIX. (33) SEPTEMBER. 1903 



