Robertson — North American Bees. 319 



vertex; the latter with a conspicuous median tubercle reach- 

 ing from occiput nearly to anterior ocellus ; labrum short and 

 rounded, black; mandibles except base rufous, strongly 

 dentate; antennae black; the head and thorax with thin pale 

 pubescence ; rather close on collar and tubercles ; mesonotum 

 coarsely punctured, the punctures close anteriorly, sparse on 

 the disc ; metathorax, as well as the whole thorax beneath, 

 coarsely reticulated, the disc with semi-circular inclosure; 

 wings except base dusky, tegulae and nervures dark; legs 

 black, tibial spurs whitish. Length 7 mm. 



Illinois; one specimen. 



This species is distinguished from 8. conferlus Say by the 

 punctures of the mesonotum being not " equally close set," 

 by its entire labrum, dentate mandibles, and tuberculate ver- 

 tex, clouded wings, etc. Other specimens may not show the 

 red color of abdomen to be limited as indicated in the 

 description. 



Sphecodes davisii $. 



Black, opaque, the base of abdomen shining; head, thorax 

 and legs with rather long, whitish pubescence, more close on 

 clypeus, cheeks and thorax beneath; mandibles, except base, 

 rufous; antennae dull ferruginous beneath, short, joints in- 

 creasing in length from second to fourth ; fourth and follow- 

 ing joints subequal; mesonotum rather closely and strongly 

 punctured, with median and lateral raised lines; metathorax 

 strongly reticulated, with a semicircular inclosure ; tegulae 

 testaceous exteriorly ; wings hyaline, nervures testaceous, 

 stigma black ; legs black, apical joints of tarsi ferruginous; 

 abdomen almost impunctate at base, towards apex closely and 

 finely punctured, first and fourth segments at apex and the 

 second and third entirely ferruginous. Length 10 mm. 



Michigan ; one $ specimen. 



Dedicated to Mr. G. C. Davis, of Michigan Agricultural 

 College, from whom the specimen was received. No reliance 

 need be placed on the definite limitation of the red color of 

 abdomen in the description of a single specimen. This is 

 the largest male Sphecodes I have seen. 



