30 Myron Harmon Szvenk 



ceedingly like the Ontario females above referred to D. simile, but 

 the puncturation of the head and thorax is very much finer. 



Dianthidium (Dianthidium) subparvum n. sp. 



$. Length 7 mm. Black; two spots on sides of clypeus, lateral face 

 marks which are broad opposite clypeus but which abruptly narrow to 

 mere lines that follow orbit nearly to summit, short narrow lines behind 

 summits of eyes, spots on tubercles and tegulae, knees, short narrow stripes 

 on bases of first four tibiae and spots at base of hind tibiae, lateral spots 

 and a median line on abdominal tergite I, deeply posteriorly emarginate 

 and medially interrupted bands on tergites 2-4, and two large exteriorly 

 emarginate spots on tergite 5, yellow. Vertex and mesoscutum very closely 

 punctured, finely so on vertex. Pubescence pale, very sparse except for a 

 rather copious patch on sides of propodeum. Ventral scopa and hair on 

 inner side of basitarsi pale orange. Wings darkened, heavily so in mar- 

 ginal cell, nervures and stigma black. 



c?. Length 8 mm. Black; clypeus, lateral face marks which narrow 

 to lines before attaining tops of eyes, mandibles except tips, postorbital 

 lines above, tubercles, edges of tegulae broadly, two small spots on anterior 

 margin of mesoscutum, knees, stripes on outer faces of tibiae and basi- 

 tarsi, three spots on abdominal tergite i, broad bands on tergites 2-5, which 

 are deeply indented or barely interrupted medially and very broadly and 

 deeply emarginate on posterior margin laterally, yellow. Tergite 6 black 

 and with a heavy median carina. Pygidium heavily medially carinate, the 

 carina ending in a broad and slightly apically emarginate tooth, on either 

 side of which are rather deep emarginations, the lateral lobes thus set off 

 rounded and mostly yellow. Hind coxae with large stout yellow spines. 

 Head and thorax densely but not coarsely punctured, abdomen very coarsely 

 but not closely punctured, tergites 1-5 with the apical margins narrowly 

 smooth, reflexed, testaceous and impunctate. 



Type. — Pullman, Washington (C. V. Piper; Wash. Exp. Sta. 

 No. 127), 5. 



Allotype. — Okanagon, British Columbia, August (W. H. Har- 

 rington, No. 54), c^. 



This species belongs to the parvuni group. The female is of 

 the size of D. parvum (Cresson), but may be separated at once by 

 the wholly black mesoscutellum, lack of yellow spots on the ante- 

 rior margin of mesoscutum, and the greatly reduced postorbital 

 lines. By the same characters it may be separated from D. simile 

 (Cresson). From D. pudens (Cresson) and the female of D. 

 piidicum (Cresson), the deep yellow color of the ornaments sep- 



30 



