Robertson — North American Bees. 349 



angles ; mandibles stout, two toothed below, apex with yel- 

 lowish hairs ; ocelli about one-third of the distance from ver- 

 tex to insertion of antennae ; metathorax above and large 

 oval depression below, smooth, shining and impunctate; 

 wings hyaline, nervures fuscous, tegulae black with dull testa- 

 ceous spot, second submarginal cell wider than first, receiving 

 first recurrent nervure about one-third from the base and the 

 second near the tip ; first segment of abdomen widely concave 

 at base, segments 2-4 depressed basally, 1-4 with narrow fas- 

 ciae of white pubescence, widening on sides of first, 5-6 more 

 coarsely punctured, the latter depressed at apex, ventral scopa 

 white. Length 7-8 mm. 



Inverness, Florida; two 5 specimens. 



Closely resembles Acidamea producta $, but the basal seg- 

 ment of abdomen is different and the maxillary palpi three 

 jointed, etc. 



Andronicus Cress. 



Andronicus cylindricus Cress. 



Andronicus cylindricus Cresson, Proc. Ent. Soc. Phil, II, 384, (J*, 18G4. 



5. — Closely resembles the mule, the clypeus closely and 

 finely punctured, emarginate at tip, mandibles quadridentate, 

 antennae black; wings a little irregularly clouded, second 

 submaro;inal cell receiving first recurrent nervure near the 

 base and the second near the tip ; abdomen at base subtruncate, 

 with a median impressed line, segments 1-5 with narrow fasciae 

 of white pubescence, apical margin of sixth segment hardly 

 depressed, scopa white or pale yellowish. Length 9-12 mm. 



Carlinville, Illinois ; one .^^ five 5 specimens ; Conn. 

 (Cress.), Can. (Prov.). 



The female resembles Alcidamea producta 5, but is larger, 

 more finely punctured, the clypeus more closely, second sub- 

 marginal cell receiving first recurrent nearer the base, apical 

 margin of abdomen not so depressed, etc. 



Alcidamea Cress. 

 Alcidamea truncata Cress. 



Alcidamea inmcaia Cresson, Trans. Am. Ent. Soc. VII, 108, (^, 1878. 

 5. — Black, more shining and more sjjarseiy punctured 

 above ; head as wide as thorax, sides of face with thin pale 



