ANDRENA. 53 



cence, and a deep channel on each side at the margin of the eyes. 

 Thorax very finely punctured ; wings fulvo-hyaline, the nervures, 

 stigma, and tegulae rufo-testaceous ; legs obscure rufb-piceous be- 

 neath, their pubescence fuscous above. Abdomen oblong-ovate ; 

 the apical margins of the second and third segments more or less 

 rufo-piceous ; the third and fourth segments laterally, and the fifth 

 entirely, fringed with pale fulvous pubescence, the apical segment 

 with fulvous pubescence ; beneath rufo-piceous. 



Hah, Mexico, Orizaba. 



This species resembles A. sodalis, but is distinguished from it by 

 the fuscous scopa on the posterior tibiae. 



10. Andrena agilis. 



Male. Length 4 lines. — Coal-black, the head and thorax opaque, 

 abdomen smooth and shining. The clypeus yellowish white, on 

 each side of it, on the face, there is some black pubescence ; at the 

 insertion of the antennse a little pale pubescence, the same on the 

 cheeks ; the antennae as long as the thorax. The thorax with a 

 thin long hoary pubescence ; wings hyaline and iridescent, the 

 nervures testaceous. Abdomen lanceolate, much attenuated at the 

 base ; on the apical margins of the second, third, and fourth seg- 

 ments laterally a narrow fringe of white pubescence ; the two 

 apical segments testaceous and with white pubescence. 



Uab. Mexico, Oajaca. 



11. Andrena modesta. 



Female. Length 3 lines. — Head and thorax black ; abdomen ferru- 

 ginous, with the base black. Head closely punctured, the clypeus 

 coarsely so ; the flageUum of the antennae fulvous beneath ; tips of 

 the mandibles rufo-piceous. Thorax finely punctured above ; wings 

 hyaline and iridescent, slightly fuscous towards the apex, the ner- 

 vures and stigma dark fuscous; the basal joint of the posterior 

 tarsi with white pubescence within. Abdomen with the first seg- 

 ment black and its apical margin ferruginous ; the three following 

 segments ferruginous, the rest black ; the red segments have a 

 lateral small fuscous or black macula ; beneath black, with the 

 margins of the segments ferruginous. 



Hab. Mexico, Oajaca. 



12. Andrena commoda. 



Female. Length 6 lines. — Black ; the abdomen ovate and shining, 

 its apex, as well as the posterior legs, with bright fulvous pubes- 

 cence. The face with pale pubescence ; the clypeus shining 

 and rather strongly punctured ; the flageUum, except the basal 



