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, 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 $ specimens. 



