164 THE CANADIAN ENTOMOLOGIST. 



anal fimbria dark purplish-brown (ochraceous in macoiipinetisis). It is 

 also very close to A. perarmata, Ckll., a species with black facial fovese. 

 In this respect Prof. Cockerel), to whom several of my specimens were 

 submitted, writes as follows: "Your 9 differs from ^perarmata by 

 lacking the black hair on metathorax. Also, type perarmata has the 

 process of labrum more pointed than in your insect." The $ of Cockerelli 

 may be readily distinguished from that of perarmata by the absence of 

 a tooth at the base of the mandibles. 



A?idrena Milwaukeensis, n. sp. $. — Length ii mm.; black, with 

 bright fulvous, erect, stiff hairs on vertex, thorax above, and first two 

 segments of abdomen above, otherwise the pubescence is black ; vertex 

 minutely granular ; cheeks rounded, with thin, black pubescence, which 

 does not conceal the sparse shallow punctures ; front finely striate ; facial 

 fove£e broad, appearing dark chocolate brown when viewed from above ; 

 antennae slender, brownish, dull ferruginous beneath towards the tip ; 

 joint 3 of flagellum hardly longer than 4 and 5 together; a patch of light 

 hair about the insertion of the antennje; clypeus smooth, shining, covered 

 with short, thin, black pubescence ; on the sides of the clypeus the 

 punctures are small and crowded, towards the middle they become coarse 

 and rather sparse ; a median impunctate and polished area, widening 

 gradually below ; process of labrum shining, truncate, emarginate ; 

 mandibles black with a ferruginous area near the tips ; the mesonotum 

 and scutellum are opaque, granular, not punctured, thickly covered with 

 fulvous pubescence ; tegulas testaceous ; wings fibro-hyaline, stigma 

 testaceous, nervures dark brown ; second submarginal cell somewhat 

 narrowed above ; the first recurrent nervure joins the latter near the 

 second transverse cubital nervure ; third submarginal cell more than twice 

 as long as second ; enclosure of metathorax distinctly outlined by a 

 smooth impressed line, with small rugae at its base; legs black, with black 

 hairs, becoming dark brown on the front tibia; ; abdomen tessellate, 

 without punctures, black, shining, with sh'ght metallic reflections ; seg- 

 ments 2 to 4 are depressed about one-third apically; there is a patch of 

 fibrous pubescence on segments i and 2, covering segment i almost 

 entirely, and becoming narrow towards the apex of segment 2 ; otherwise 

 the segments are clothed with short, stiff black hairs, not forming apical 

 fascise ; anal fimbria black. 



^ . — Length g mm.; differs from tiie female as foUov/s : Pubescence 

 longer, but thinner, entirely fulvous, without a trace of black hairs ; head 



