608 PROCEEDINGS OF THE ACADEMY OF [All, 



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and I thought at first it might be N. nrmatella; but the following char- 

 acters indicate hella rather than armatella: Supraclypeal mark absent ; 

 antennae fulvous beneath (nothing said about yellow on scape) ; tegulte 

 ferruginous; abdominal bands interrupted; apical margins of ventral 

 abdominal segments fusco-ferruginous. 

 Nomada hoodiana, sp. n. 



2 . — Length about 9 mm.; ferruginous-red, the color of the abdomen 

 bright; facial quadrangle square; cheeks with the anterior half red 

 and the posterior half black ; a little blackish about bases of antenna?, 

 sending lines downward to middle of sides of clypeus; ocelli on a small 

 black patch; antennae entirely red, except for a small black mark on 

 scape above; third joint subequal with fourth; mesothorax with one 

 black band; tubercles rather coppery, surrounded by black; en- 

 closure of metathorax entirely red, minutely wrinkled at base ; tegula 

 yellowish-ferruginous; wings dusky along the veins; stigma dark red- 

 dish; second submarginal cell broad, third greatly narrowed above; 

 basal nervure far basad of trans verso-medial; legs red; first four fem- 

 ora with a black mark at base beneath; hind femora with much 

 black suffusion beneath; abdomen of the comparatively long and nar- 

 row type; base of first segment black, with four reddish spots, tlie an- 

 terior edge of the black concave, and wavy in the middle; second seg- 

 ment wdth small and obscure suffused yellow lateral spots; fifth seg- 

 ment with a large semilunar velvety depression ; pygidium very broad ; 

 venter red, a black fish-tail mark on basal segment. 



Hah. — Mt. Hood, Ore.; collector unknown, (Coll. Acad. Nat. Sci. 

 Phila.). The depression on the fifth segment is nearly twice as wide 

 as in the Pennsylvania species I take for N. depressa. 



The species in the following table all have the abdomen strongly 

 punctured, the punctures round and distinct. They belong to Micro- 

 noviada and Centrias. Those marked (D.) are placed from the 

 description, specimens not being available : 



Fcjnales. 



Abdomen red, without light bands, 1. 



Abdomen with light bands, 2. 



1. Flagellum clear red martinella, Ckll. 



Flagellum strongly dusky americana, Kirby, 



2. jNIesothorax red, basal half of abdomen at least largely red, . 3. 

 Mesothorax black, with little, if any, red, 4. 



3. Basal half of abdomen bright red; apical half with white bands, 



nibicunda, Oliv. 

 Abdomen heavily marked with yellow, the two halves not con- 

 spicuously different, ivheeleri, Ckll. 



