T. D, A. COCKERELL. 235 



Osiiiia Integra Cresson. 



cf . Campus of University of New Mexico, Albuquerque, 

 at flowers of Astragalus, April 19 and 26 {J. R. IVaison) . 

 New to New Mexico. 



Osiuia watsoni u. sp. — c?. Length about 10 mm., general aspect 

 of O. latreillei Spin., but very distinct by the peculiar antennae. Head 

 and thorax yellowish-green, but sides of thorax, and sometimes front 

 and vertex bluish or blue-green, scutellum with brassy tints ; abdomen 

 yellowish-green, varying to blue-green, hind margins of segments con- 

 colorous ; legs black, the hind femora in front very faintly metallic ; 

 hair of face dense and white, of head and thorax above long and pale 

 ochreous ; of abdomen pale ochreous, thin, not forming evident bands ; 

 mandibles shining, with a long apical tooth, and a variably crenulate 

 or subdentate inner cutting margin ; eyes reddish-brown in the type, 

 in the other specimen green ; scape and second antennal joint black ; 

 flagellum clear light ferruginous above and below, strongly crenulated 

 behind, but with the last joint flattened, more or less discoid, shining 

 black ; tarsi ferruginous apically ; middle tarsi normal except that the 

 basitarsus is somewhat thickened ; hind basitarsus conspicuously broad- 

 ened and flattened toward end ; nervures and stigma dark, more or 

 less reddish ; sixth abdominal segment with a large notch in type, a 

 very small one in the other specimen ; seventh segment narrowed api- 

 cally, with two very strong parallel teeth ; venter with no unusual 

 features. 



Habitat. — Campus of University of New Mexico, Albu- 

 querque, at flowers of Astragalus, April 8 (type) and 18 

 (y. R. Watson). Very easily known by the unique antennae. 



Dioxys pliacelitie n. sp. — 9 . Length about S\ mm. ; black, eyes 

 dark plumbeous; tarsi, apices of tibise, and hind tibiae suffusedly behind, 

 dark red ; hind spurs red; hair of head and thorax pale ochreous, 

 darker and redder on face ; hind margins of abdominal segments with 

 narrow reddish-brown hair-bands ; head, thorax and abdomen coarsely 

 and densely punctured ; tegulge piceous ; wings dilute fuscous, slightly 

 violaceous ; postscutellar spine slender ; apical segment of abdomen 

 broad, triangular, with the sides in outline gently convex, and the 

 apex obtuse ; venter strongly punctured. 



Habitat. — Albuquerque, New Mexico, at flowers of Phace- 

 lia corrugata A. Nelson, April {J. R. Watson). Readily 

 known from other American species by the shape of the last 

 abdominal segment and the reddish abdominal bands. 



Auclreiia coiuberiana n. sp. — 9 . Length 9 mm. or a little less; 

 head, thorax and legs black, the small joints of the tarsi ferruginous ; 



TR.\NS. AM. ENT. SOC, XXXVII. 



