THE CANADIAN ENTOMOLOGIST. 367 



Halictiis Lerouxii Lep. — i $ . 

 ' ffalictus Coo/eyi Cva.\\i. — r 9- 

 Halictiis arapahonum Ckll. — 9 9 's- 



Sphecodes (SpJiecodinin) nitidissinms, n. sp. 



9 . — Length a litile over 5 mm., very shiny ; black, the abdomen 

 bright chestnut-red, fourth segment (except extreme base), fifth and apex 

 black ; face with white hair ; eyes converging below ; mandibles bidentate, 

 red, except at base ; labrum entire ; clypeus sparsely punctured ; flagelhim 

 thick, family brownish beneath ; mesothorax rather sparsely punctured, 

 parapsidal grooves strong ; area of metathorax regularly crescentic, very 

 strongly defined, with irregular longitudinal wrinkles ; legs black with 

 silvery hair, small joints of tarsi becoming brownish ; tegulae brown, pallid 

 toward margins ; wings gray, nervures and stigma piceous ; abdomen very 

 smooth, the second segment hardly at all punctured. Close to 6". Cres- 

 sofiii Rob., but separated by the dusky wings and the regularly crescentic 

 (instead of boat-shaped) area of metathorax. From 6". eust ictus Ckll. it is 

 readily known by the almost impunctate abdomen. 



Hab. — Steamboat Springs, Colorado, May 27, i 9- 



Nomada ( Noinada s. str.) fo/itis, n. sp. 

 9 . — Length about 7 mm., rather slender, bright ferruginous red, 

 marked with black ; a little yellow at lower corners of face ; second to 

 fourth abdominal segments with a small yellow spot on each side, fifth 

 without yellow, although a pair of very faint yellowish dorsal spots can-be 

 seen on close inspection ; head broad ; eyes dark (not at all greenish) ; 

 the scanty hair of head and thorax white ; front and vertex each with a 

 large black patch ; cheeks black behind ; flagellum thick, red above and 

 below ; third antennal joint yellowish in front, much shorter than fourth 

 on outer, and somewhat shorter on inner side; mesothorax rough, with 

 three black stripes ; scutellum moderately prominent, scarcely bigibbous ; 

 metathorax with a broad median black stripe ; pleura red, but above is a 

 round red area surrounded by black ; legs red, more or less suffused with 

 blackish ; tegulae red, punctured; wings dusky, with a pallid area beyond 

 the cells ; stigma ferruginous ; nervures piceous ; b. n. going a very short 

 distance basad of t. m.; second s. m. receiving first r. n. about the begin- 

 ning of its last third ; third s. m. large, but narrowed nearly to a point 

 above ; abdomen minutely i)unctulate, hind margins of the segments 

 broadly dusky, but not black ; base of first segment with a blackish spot 

 on each side ; venter clear red. Close to N. nigroc'nicta Smith, and 



