334 Trans. Acad. Sci. of St. Louis. 



inclining to dull ferruginous on hind tibiae and tarsi ; scopa 

 thin and whitish; abdomen shining, faintly roughened and 

 punctured, thinly pubescent, segments 2-4 with thin, narrow, 

 whitish fasciae, anal fimbria fuscous. Length 9 mm. 



$. — Closely resembling the female, the mandibles longer, 

 basal process of labrum subquadrate, cheeks broader, pre- 

 senting a rounded angle at a point opposite and a little below 

 the middle of the eye, third joint of antennae about equaling 

 next two together, abdomen with margins of the segments 

 narrowly pale testaceous, apex with pale pubescence con- 

 cealing the ventral process. Length 7-8 mm. 



Carlinville, Illinois; 13 $, 5 ^ specimens. 



The species is named as above because it seems to depend 

 for pollen upon the flowers of Geranium maculatum, whose 

 large grains the thin scopa is well suited for holding. 



Andrena arabis $. 



Black, pubescence of head and thorax thin and pale ochra- 

 ceous ; head not broader than thorax, somewhat produced 

 behind the eyes, hardly striate before ocelli ; clypeus finely 

 roughened, opaque, sparsely punctured laterally, in the middle 

 more shining, coarsely punctured and irregularly depressed, 

 sometimes presenting two irregular longitudinal grooves sep- 

 arated by a raised portion; basal process of labrum small, 

 triangular, slightly truncate or emarginate; mandibles except 

 base ferruginous ; third joint of antennae as long as next two 

 together, sixth and following joints dull testaceous beneath ; 

 mesonotum opaque, finely roughened, with sparse shallow 

 punctures, inclosure of metathorax with rather fine wrinkles 

 extending half way towards apex ; wings yellowish hyaline, 

 tips slightly clouded, nervures, stigma and tegulae testaceous, 

 second submarginal cell two-thirds the length of third, receiv- 

 ing recurrent nervure about the middle; legs black, tibiae and 

 tarsi with pubescence inclining to blackish, scopa pale; 

 abdomen at base opaque, finely roughened, with shallow punc- 

 tures, more shining on fourth and fifth segments, 2-4 with 

 apical fasciae of white pubescence, interupted on second, 

 fimbria fuscous. Length 10 mm. 



Carlinville, Illinois, 18 5 specimens. 



