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 iinpunctate; 

 wings hyaline, nervures fuscous, tcgulae 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 $ specimens. 



Closely resembles Acidamea jpvoducta o, 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, tf, 18G4. 



2. — Closely resembles the male, the clypeus closely and 

 finely punctured, emarginate at tip, mandibles quadridentate, 

 antennae black; wings a little irregularly clouded, second 

 submarginal 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 $ t five 5 specimens; Conn. 

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



The female resembles Alcidamea prodncta 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 truncata Cresson, Trans. Am. Ent. Soc. VII, 108, J\ 1878. 

 5. — Black, more shining and more sparsely punctured 

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



