June 1896.] 



SUPPLEMENT TO PSYCHE. 



31 



ward lateral extensions of pale color on face 

 more conspicuously bulbous at ends, the 

 base from which they arise oblique, being 

 lower on the orbital margin than mesad : 

 scape with only a small pale spot (this may 

 b^ the case also in true rudbeckiae), flagellum 

 below brownish. Tubercles with a yellow 

 patch bearing a dark spot, tegulae wholly 

 dark. Wings strongly tinged with brownish, 

 decidedly larger. Enclosed space of meta- 

 thorax distinctly longitudinally subreticu- 

 lately wrinkled, one might perhaps say can- 

 cellate. Mesothorax pubescent. 



Hah. — New Mexico; Ruidoso Creek, 

 7500 feet. July 6, 1S95, on Scrop/iuhiria 

 (E. O. Wooton, no. 74). 



Prosapis rudbeckiae, race subdigitata. 

 n. race, ^ . — Slightly smaller, about 4.J mm. 

 long; pale markings apricot-color (probably 

 reddened by cyanide), upward lateral exten- 

 sions of pale color on face little swollen and 

 rather short, the base from which they arise 

 oblique, but higher on the orbital margin 

 than mesad. Scape wholly dark. Tubercles 

 and tegulae wholly dark. Wings dusky- 

 hyaline, not yellowish or brownish. Meso- 

 thorax with greyish pubescence. Enclosed 

 area of metathorax strongly rugoso-punctate. 



//(?«.— Colorado; C. F. Baker, 1658. 

 Foothills west of Fort Collins, June 15, 1895. 



The two above forms are probably valid 

 species, but for the present it will be a con- 

 venience to place them under rudbeckiae. 

 The form named subdigitata present char- 

 acters intermediate between rudbeckiae and 

 digitata ; it differs from the latter by its 

 pubescent mesothorax (that of digitata be- 

 ing virtually bare), its greyish wings (those 

 ofdigitata being distinctly tinged brownish) 

 its somewhat shorter second submarginal cell. 

 Yet, on the whole, it must be confessed that 

 it is as near to digitata as to rudbeckiae. 

 The following table will separate the allies of 

 of rudbeckiae. 



A. Tubercles wholly dark. 



I. Wings tinged greyish, mesothorax pu- 

 bescent subdigitata. 



2. Wings tinged brownish, mesotboiax 

 b.ire. .... digitata , 



B- Tubejcles partly yellow. 



1. Comparatively large, face white, scape 



wholly white in front. . hakeri. 



2. Face pale yellow, scape with at most a 



yellow mark. 

 cf. Larger, wings tinged brownish. 



ruidoscusi.s. 

 b. Smaller, wings tinged grevish. 



rudbeckiae. 



Prosapis triangularis, n. sp., ^ . — Length 

 5.4 mm., rather stout, black with deep yel- 

 low markings. Head fairly large, face little 

 narrowed below; face-markings deep lemon- 

 yellow, including clypeus, a large elongate- 

 triangular or low-conical supraclypeal mark, 

 the apex of which is obtuse, and the usual 

 lateral marks, deeply notched by antennal 

 sockets, extending thence narrowly upwards 

 along orbital margin to a pointed termina- 

 tion. Scape wholly black, stout but not 

 dilated; flagellum dark brown. Front and 

 vertex very coarsely pimctured. Mesothorax, 

 scutellum and pleura with very large close 

 punctures, anterior part of pleura becoming 

 almost cancellate. Enclosed area of meta- 

 thorax not well-defined, with large confluent 

 pits. Hardly any pubescence on thorax, 

 except a fringe of short white hairs at 

 lateral ridges of metathorax. Hind border 

 of prothorax interrupted in middle, a large 

 patch on tubercles, and spot on tegulae, deep 

 yellow. The dark (hyaline) spot on patch on 

 tubercles is inconspicuous. Anterior femora 

 beneath, middle and hind femora at extreme 

 tips, anterior tibiae in front, basal third of 

 middle tibiae, basal half of hind tibiae, and 

 extreme tips of four hind tibiae, yellow 

 more or less suffused with rufous. Tarsi 

 pale rufescent, first joint of four hind tarsi 

 pale yellow. Wings fuliginous, clear at 

 base. Abdomen shiny, with no distinct 

 hair-bands. Dorsum of first segment 

 impunctate. 



Hab. — Georgia, exact locality and collec- 

 tor unknown. Sent by Mr. Fox. In CoSI. 



