268 - NORTHERN ZOOLOGY. 



DESCRIPTION. 



? 

 This little insect is so extremely like Halictus Icevisp that at first I regarded it merely as a 

 variety of that species, but upon a closer inspection they appear to me distinct. In H. crassicornis 

 the antennas are proportionally more robust, but the principal difference lies in the sculpture of the 

 thorax. In H. loevis that part is visibly punctured with scattered punctures, but in the insect I am 

 describing, under a common lens, the punctures are scarcely discernible, but under a higher power, 

 besides a slight channel drawn longitudinally, innumerable very minute punctures appear. In the 

 former also the stigma of the upper wings is piceous, while in the latter it is testaceous. In other 

 respects they are perfectly similar. 



CLIX. Genus ANDRENA. Fab. 



(371) 1. * Andrena impuncta. Impunctured Andrena. 



A. (impuncta) nigra albitlo vil/osa ; tibiis posticin scopa alba ; abdomine lavi, ant ice a/bidv, postice nigro , pilosa. 

 Impunctured Andrena, black with white hairs, brush of the posterior tibiee white ; abdomen impunctured, anteriorly 

 cloathed with white hairs and posteriorly with black. 



Length of the body 51 lines. 



A single specimen taken in the Journey from New York to Cumberland-house. 



DESCRIPTION. 



? 



Body black, cloathed with rather long whitish hairs, especially the face below the antenna? ; hairs 

 of the thorax rufescent ; wings subhyaline a little darker at the tip ; nervures testaceous, post-costal 

 black ; brush of the posterior tibia white : abdomen impunctured with the hairs of its anterior half 

 white ; the other hairs above and below black. 



This species a good deal resembles Andrena nitida^ but the abdominal segments of that species 

 are minutely punctured at the base, which is not the case with this, and the brush of the posterior 

 tibia; is of a different colour. 



(372) 2. Andrena varians. Varying Andrena. 



Apis varians. Ross Fn. Etrusc. Mant. 142, 317. Panz. Fn. Germ, lvi, t. 12 

 Melitta varians. Kirb. Men. Ap. Engl, ii, 117, 58. 

 Andrena varians. Steph. Cat. i, 300, 5179, 24. 



Length of the body 5i lines. 



Three specimens taken in the Expedition. Locality not stated. 



5 Kirb. Mon. Ap. Angl. ii, 65, 24 6 Ibid, ii, 104, 51. 



