New British Bees. lix 



griseous pubescence ; the margins of the segments have each a band of griseous 

 pubescence ; the anal rima is fulvous. 



Male. — (Length 3| lines). Closely resembling the female ; nose pale yellow ; the 

 antennae rufo-piceous beneath, otherwise as in the female, excepting that all the 

 tibiae and tarsi are pale yellow ; the anterior tibiae stained in front with ferruginous ; 

 the intermediate pair have a black stain in front, and the posterior in front and behind 

 also have a black stain ; the claws ferruginous. 



I have a pair of this species in my own collection, taken in Hampshire ; and there 

 are several in the cabinet of the British Museum, taken in Devonshire. It is closely 

 allied to Hal. virescens of St. Fargeau, but he makes no mention of the pale legs. 



Andrena extricatus. 



Female. — (Length 5 lines). Black : the face clothed with a short pale fulvous pu- 

 bescence ; that on the vertex is black. Thorax thinly clothed above, densely on the 

 sides, and metathorax laterally, with pale fulvous pubescence ; that on the legs is of 

 the same colour, except that on the anterior tibiae, which is fuscous ; the apical joints 

 of the tarsi are rufo-piceous ; the claws ferruginous ; the basal joint of the posterior 

 tarsi ferruginous within ; the wings hyaline, very slightly clouded on their apical 

 margins : the nervures ferruginous. Abdomen closely punctured, a little pale pu- 

 bescence at the base ; the first and three following segments have a white marginal 

 fascia, the first usually interrupted ; the anal fimbria sooty black. 



Male. — (Length 4 lines). Black ; its pubescence griseous, tinged with fulvous on 

 the face, tibiae and tarsi within ; wings hyaline ; the nervures pale ferruginous. Ab- 

 domen ovate-lanceolate ; the second and three following segments have a narrow 

 white marginal fascia ; the apex fulvous. 



This species is allied to A. fulvicrus, and I had considered it to be merely a variety 

 of that species, the female being the only sex I was acquainted with, the colour of 

 the abdominal fascia being the only prominent difference ; but having now met with 

 both sexes, I am quite satisfied of their specific difference : it obtains in the greatest 

 degree in the male. I should observe that my specimens of both sexes are fine, fresh 

 and recently developed. 



Andrena frontalis. 



Male. — (Length 4 lines). Black : head wider than the thorax ; the face has a 

 thin hoary pubescence ; the clypeus white, having on each side an angulated black 

 spot ; the mandibles arcuate. Thorax shining, with scattered punctures, having a 

 long, thinly scattered, griseous pubescence ; the legs black, with the claws ferrugi- 

 nous ; the wings hyaline, their apical margins slightly clouded ; the nervures and 

 tegulae black. Abdomen ovate-lanceolate, punctate ; the margins of the segments 

 slightly constricted ; a little pale ochraceous pubescence at the apex ; beneath, the 

 third and two following segments are fringed with bright fulvous pubescence. 



This conspicuous species is from Devonshire. It was captured by my friend Mr. 

 S. Stevens, who kindly presented it to me. 



Andrena constrictus. 

 Male.— (Length 4 lines). Black : antennae nigro-piceous, nearly as long as the 



