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len, and two of them a small larva. On the 2'Jth of June six 

 full-grown larva- were exhumed, and one about half-grown. 

 About the first of August the 

 larva transforms to a pupa, and 

 during the last week of this month 

 the mature bees appear. 



In Halicttis, which is a genus 

 of great extent, the head is trans- 

 verse, and fiattish ; the month- 

 parts are of moderate length, the 

 tongue being very acute, with 

 acute paraglossre half the length 

 of the tongue, while the labial 

 palpi are not quite so long as 

 the paraglossas. There are three 

 subcostal cells in the wings, with 

 the rudiments of a fourth often 

 present, and the second cell is 

 squarish. The abdomen is ob- 

 long ovate, with a longitudinal 

 linear furrow on the tip in the 

 female. In the males the body l 

 is longer and the antenmv more 

 filiform and slender than usual in 

 this family. 



The larvae are longer, and with 

 more acutely convex segments 

 than in Andrena. The pupa? 

 differ much as the adult bees from 

 Andrena, especially in the shorter 

 month-parts. Fig. so. 



Halicttis parallelus Say excavates cells almost exactly like 

 those of Andrena ; but since the bee is smaller, the holes are 

 smaller, though as deep. Mr. Emerton found one nest, in a 

 path, a foot in depth. Another nest, discovered September Uth, 

 was about six inches deep. The cells are in form like those of 

 Andrena, and like them are glazed within. The egg is rather 

 slender and much curved; in form it is long, cylindrical, ob- 

 tuse at one end, and much smaller at the other. The larva 



10 



