136 THE CANADIAN ENTOMOLOGIST. 



NOTES ON BEES OF THE GENUS PROSOPIS, WITH 

 DESCRIPTIONS OF NEW SPECIES. 



BY CHARLES ROBERTSON, CARLINVILLE, ILLINOIS. 



Pro sop is affinis, Sm. 



Twenty-four male and female specimens sent to Mr. Cresson in 1887 

 were identified as this species. Since that time I have regarded it as a 

 variable species, and in my last paper (Trans. Am. Ent. Soc, XXII., 

 1 16) indicated it as a synonym of P. modesta. Say. I now think there are 

 two species, closely allied, but characterized as follows : — 



Prosopis affijiis, Sm., ? .—Black, head and thorax opaque, closely 

 punctured ; abdomen almost impunctate, first segment smooth and 

 shining, lateral apical margin with a patch of whitish pubescence ; 

 flagellum testaceous beneath; subtriangular mark on each side of face, 

 two spots on collar, tubercles, spot on tegulaj, edge of wing base beyond 

 tegul^e, and base of all the tibiae, lemon-yellow ; enclosure of metathorax 

 strongly rugose at base ; wings hyaline. Length, 5-6 mm. 



S .— Resembles the female ; first segment of abdomen less shining, 

 more punctate, apical margins of segments subtestaceous and sub- 

 fasciate ; face below antennae, ascending broadly on each side nearly to 

 summit of scape and notched around insertion of antennse, labrum, 

 mandibles, except rufous tips, concave exterior edge of scape, two spots 

 on collar, spot on tegulse, edge of wing base, tubercles, tarsi, and tibis, 

 except a spot behind anterior and middle pairs and ring on posterior pair, 

 lemon-yellow. Length, 5-6 mm. 



Illinois ; 16 (J, 11 $ specimens. 



Four males differ only in having no yellow on scape ; one of these 

 also without a spot on tegulae. 



I think there is no question but that this is the P. affinis of Smith, 

 but the male described by him probably does not belong to it. If, how- 

 ever, this should prove to be distinct from P. affinis, the name of Prosopis 

 zizicB is proposed for it. 



Prosopis modesta, Say, ?.— Closely resembles the female of/'. 

 affinis; wing a little more dusky, the extreme base without yellow, tegulae 

 rarely with a small spot in front. Length, 4-6 mm. 



^ . — Scape stout, not strongly concave exteriorly, as in preceding ; 

 first segment of abdomen less punctate, more smooth and shining ; face 

 below antennas, narrowing to a point on each side at eye margin ; two 



