THE CANADIAN ENTOMOLOGIST 207 



Perdita citrinella Graenicher. 



Minot and Granville. At Petulosfemon oligophyllum; Jul} 8 and Aug. 

 22, five females, eleven males. 



Female. — Dark sutures of head and thorax quite prominent; two specimens 

 have tibiae dark except knees, middle tarsi dark, ventral surface of abdomen 

 dark medially, and scape and upper side of flagellum dark. 



Male. — Closely resembles the female. Hind tibiae usually dark behind; 

 abdomen usually with dark triangular patches at sides of segments 2 to 5. 



The males does not seem to have been previously described, although 

 Crawford recorded* a specimen from Medicine Hat, Alberta, Canada. The 

 markings of both sexes vary quite a little, but there is no suggestion of inter- 

 grading with the following species. In a series of eight males taken at the same 

 time, considerable variation is known. The dark lines next the eyes are shorter 

 than in the female, but the spots between these and the antennae are prominent, 

 sometimes each occupying one-fourth the width of the front; well developed 

 spots are sometimes present at sides of lateral ocelli and small ones behind apex 

 of eyes. Two have lateral brown lines on the mesoscutum, while one has suf- 

 fused brown lines both medially and laterally, and nearly complete bands on 

 abdomen. One has hind tarsi yellow. 



Perdita perpallida Cockerel 1. 



Sand hills near Sheldon, Aug. 12, 1916, and Aug. 21, 1918, at Petalostemon 

 villosum; ten females, sev^en males. This species would seem to have been 

 expected where the preceding was taken, and vice versa. This plant occurs 

 only in this part of the State and near Pleasant Lake and Towner (not far from 

 where Perdita citrinella was taken) ; P. oligophyllum and piirpureiim are common 

 plants throughout the State. 



Perdita martini Cockerell. 



1895. — Perdita martini Cockerell, Proc. Acad. Nat. Sci. Phila., 1895, p. 

 14, male. 



Male.— Agrees closely with the original description. The yellow on the 

 face extends about to the middle of the anterior ocellus, its upper line irregular, 

 being depressed under the lateral ocelli and slightly produced next the eye, a 

 narrow line following the direction of its upper border reaching the lateral 

 ocellus. Brown of the antennae above mostly limited to the junctions of the 

 first four or five joints of the flagellum; yellow on cheeks extending fully two- 

 thirds the length of the eyes. 



Meso-pleurae with a broad yellow mark extending from front coxae to mid- 

 way between middle coxaj and tubercles; middle tibiae with a dark spot above, 

 posterior tibiae dark, and femora on apical half both above and below; posterior 

 tarsi brownish; stigma yellow, nervures brownish. 



Female. — Length 5 mm. Yellow on clypeus, labrum, a low supra-clypeal 

 spot, spot behind base of mandibles, lateral face marks extending from middle 

 of clypeus to slightly above base of antennae with an irregular margin, scape of 

 antennae and lower side of flagellum, tegulae, tubercles and a line on prothorax 

 connecting them. Legs with coxa' dark, trochanters yellow; anterior yellow 

 except a spot in inner side of femora; middle with a larger spot on femora, and 

 a small one on outer side of tibiae; p osterior dark exc ept knees. Dark bands of 

 *Can. Ent. vol. 44, p. 3.59, 1912. 



