264 Mr. T. D. A. Cockerell — Bescrtpttons and 



line or ridge ; orbits sliglitly converging below; flagellum 

 ferruginous beneath except basally and at extreme apex ; 

 tegulse with a suffused red spot. Wings strongly clouded, 

 reddish ; first r. n. going beyond first intercubitus a distance 

 much more than half length of latter. Tarsi with cream- 

 coloured hair on inner side. Abdomen shining, the thin 

 white hair-bands developed only at sides; ventral scopa pure 

 white. 



Sterling, Colorado, July 1, 1921 {Grace Sandhouse). 



Compared with H. sambuci, Titus, it is less robust, with 

 much narrower face, without the well-defined polished area 

 on upper part of clypeus, and the antennse and tegulse are 

 differently coloured. Compared with H. mescalerivm, CklL, 

 it is smaller, with much less ample wings, the disc of meso- 

 thorax is more closely punctured, and the abdominal hair- 

 bands are much less developed. H. monardce^ Ckll., is quite 

 diff'erent ; Crawford suggests that it sliould be transferred 

 to Ayidronicus. 



Miss Sandhouse investigated the mouth-parts oi H. gracecs. 

 The maxillary palpi are five-jointed, with the third joint 

 longest, much longer than 4-1-5 (equal to 4 -I- 5 in sambuci), 

 second much longer than fourth (2 and 4 subequal in sam- 

 buci) ; labial palpi with second joint longer than first ; 

 tongue about as long as labial palpi ; blade of maxilla 

 very long and slender, as in other species. H. mescaley^ium 

 also differs in the palpi, having the maxillary palpi with the 

 third joint equal to the second, but the fourth much shorter 

 than second. 



The bee has a general resemblance to And ronicus cylindricus^ 

 Cress., but that is larger, with 4-dentate mandibles and 

 different venation. 



Miss Sandhouse has also collected the following, new to 

 Colorado : Xenoglossa strenua, Cress., Sterling, July 12, $ 

 on nasturtium flowers ; Halictus occidenta/is, Cress., Crook, 

 $ , Aug. 24; Perdita bigelovite, CklL, Crook, males, Aug. 

 17-18, larger than usual (length about or nearly 6 mm.), 

 and with less yellow on cheeks, but the latter character 

 varies both in Colorado and New Mexico specimens. 



Andreiia mury^eensis, sp. n. 

 ? (typ^O- — Length 9-11 mm. 



Black, with hind margins of first three abdominal seg- 

 ments (third rather obscurel}^) and base of second and third 

 (or third not evidently) ferruginous ; flagellum dull ferru- 

 ginous beneath, except at base; tegulse shining- rufo-testaceous. 

 Wings dusky hyaline, stigma dull ferruginous, nervures 

 fuscous. Legs black ; hair of head and thorax mainly 



