1865.] 87 



ments are more or less narrowed on the anterior middle, and slightly 

 indentated on each side anteriorly; sixth segment with a large trian- 

 gular yellow mark, covering nearly the entire segment above; venter 

 piceous, shining, the four basal segments each with a broad, continuous 

 yellow band. Length 8 — 9^ lines; expanse of wings 14 — 16 lines. 



^rt^A— Colorado Territory, (B. D. Walsh, Esq.) Coll. Entom. Soc. 

 Philad. 



Two 9 specimens ; % unknown. This is the largest and finest spe- 

 cies yet discovered in this country, and is readily distinguished by the 

 broad yellow fascise on the second and following segments of the abdo- 

 men, that on the second with a deep longitudinal indentation on the 

 basal middle. The Society is indebted to the kindness of Mr. Walsh 

 for this fine addition to its collection. 



2. Philanthus frigidus, Smith. 



Philanthus frigidus. Smith, Brit. Mus. Cat. Hym. iv. p. 475, %, . 

 Black; three broad stripes on face, interrupted line on collar, spot on tegulse, 

 another on postscutellum, most of tibife and tarsi, spot on each side of first ab- 

 dominal segment, and narrow fascite on remaining segments, yellow j wings 

 subhyaline. 



Female. — Black, somewhat shining, very closely and finely punc- 

 tured, thinly clothed with a pale pubescence ; head transversely com- 

 pressed; face flat, with a broad longitudinal yellow stripe on each side, 

 and another down the middle, the former does not extend higher up than 

 the insertion of the antennaa, and ends beneath in a transverse spot on 

 the extreme side of the clypeus ; the middle stripe is composed of a 

 rounded spot beneath the insertion of the antennae, and a broad, some- 

 what uneven elongate mark down the middle of the clypeus ; a dot on 

 the posterior orbits, and a spot on base of mandibles, also yellow ; an- 

 tennae subfiliform, slightly thickened towards the tip, the scape with a 

 yellow dot at the apex within. Thorax: dorsal front of mesothorax 

 uneven with longitudinal impressions; an interrupted line on the collar, 

 a dot on tubercles, sometimes wanting, and a transverse spot or dot on 

 postscutellum, yellow; scutellum shining and more sparsely punctured 

 than the rest of the thorax ; metathorax very densely and finely sculp- 

 tured, thickly clothed with a long pale pubescence, the tip of the en- 

 closed basal space is shining and transversely pinched; tegular piceous, 

 with a yellow spot in front. Wings subhyaline, tinged with fusco-fer- 

 ruginous, especially towards the tips, which have a subviolaceous re- 

 flection; nervures fusco-ferruginous. Legs black or piceous; exterior 

 tips of the anterior trochanters, spot on posterior coxae, tips of all the 

 femora, the tibiae, and base of tarsi, yellow ; a spot on the tibiae at tip 



