424 ^Ir. T. D. A. ('ock(M(ll — Descripfion.^ and 



larfje, with a few small irregular basal plicie, and a median 

 raised line continuous to hind margin ; posterior truncation 

 of mctatliorax not clearly defined as usual, its upper lateral 

 corners not defined at all, but its upper middle separated 

 by a shoi't ridge from the basal area, while an oblique 

 ciliated ridge limits it on each side ; abdomen imi)unctate, 

 microscopically transversely lincolute, first segment nar- 

 rowed. Wings clear, very faintly dusky apically ; recurrent 

 uervures ending a little before the transverso-cubitals ; 

 second submargiual cell nearly square, its inner and outer 

 sides parallel ; bases of tibiae, and anterior tibioe in front, 

 cream-colour ; tarsi pale ferruginous. 



Oaxaca, ^Mexico, April 30 (L. 0. Hoiuard). U.S. National 

 IMuseum. 



Looks like some small Pemphrcdonid wasp, but is a true 

 bee, with many plumose hairs on body. It is more or less 

 related to Vachal's P. recisa, P. puerula, P. fissa, Sec, hut 

 much smaller and very distinct. 



Prosopis subgrisea, sp. n. 



? . — Length about 7 mm., anterior wing 5"3. 



Black, with yellowish-white or brownish-white markings ; 

 mandibles and labrum black ; clypeus long, black, the lower 

 margin suffusedly reddish, but with a cream-coloured stripe 

 running down its middle (not quite reaching upper end), 

 not quite so broad as the area on either side ; supraclypeal 

 mark small, rcJundish ; lateral face-marks linear, extending 

 along orbital margins nearly halfway up front ; scape 

 and base of flagellura ferruginous, rest of flagellum black 

 above and faintly reddish below; front appearing granular ; 

 upper part of prothorax with linear light margin, and greater 

 part of tubercles light ; a light band covering anterior half 

 of scutellum, a band on postscutellum, and axillre light ; 

 mesothorax dull, coarsely punctured ; area of metathorax 

 with coarse rugse ; posterior truncation and sides of meta- 

 thorax densely covered with pale grey tomentum ; pleura 

 sparsely punctured ; tegulae with a light spot. Wings 

 brownish hyaline, with the costal field, including marginal 

 cell and beyond, fuliginous ; hind tibite with rather more 

 than basal half white. Abdomen dullish, the punctures 

 excessively minute and close ; first and second segments 

 with yellowish-white marginal hair-bands, third to fifth with 

 hind margins obscurely pallid ; apex with dark fuscous 

 hair. 



