182 [January 



Nomada tibialis, n. sp. 



Piceous, with a purplish reflection, especially on the abdomen : sides of the 

 face, spot on the middle, most of clypeus, base of mandibles, collar, tubercles, 

 two spots on pleura, spot on coxae, basal joint of posterior tarsi exteriorly, and 

 apical margins of abdominal segments, whitish ; legs ferruginous; wings sub- 

 hyaline, fuscous at tips. 



Female. — Head broad, piceous-black, shining, indistinctly punctured. 

 clothed with a short silvery-white pubescence, dense on the cheeks ; 

 sides of the face broader beneath, a minute spot beneath the base of 

 the antennas, a transverse mark on the clypeus much produced in the 

 middle posteriorly, and a spot on base of mandibles, white ; antennae 

 nearly as long as the head and thorax, piceous. Thorax piceons-black. 

 with a slight purplish reflection in certain lights, polished, sparsely and 

 fiuely punctured ; mesothorax and pleura mostly tinged with obscure 

 rufous, the latter clothed with a thin silvery-white pubescence ; collar, 

 tubei'cles, two spots on each side of pleura, the anterior one the smallest, 

 and two spots at base of the scutellum. white ; scntellum subbilobate. 

 slightly pubescent ; metathorax smooth and polished, immaculate, the 

 sides above densely clothed with appressed silvery pubescence; tegula; 

 piceous. Wings subhyaline. faintly iridescent, the apex with a fuscous 

 cloud; nervures fuscous; third submarginal cell nearly as long as the 

 first, and very much constricted towards the marginal. Legs ferrugi- 

 nous, thinly clothed with whitish pubescence; a spot on the four pos- 

 terior coxae beneath, and a line on the basal joint of the posterior tarsi 

 exteriorly, white. Abdomen ovate, piceous-black with a strong purplish 

 reflection, shining, the second segment, except its apical margin, very 

 densely and minutely punctured, the rest apparently impunctured ; near 

 the apical margin of each of the four basal segments, a narrow whitish 

 fascia, broader on the first segment, the others slightly undulate and 

 somewhat interrupted on the third segment, the posterior margin of 

 each fascia is fringed with pale pubescence ; apical segment truncate, 

 densely clothed with fuscous pubescence, with a transverse space of 

 dense pale pubescence on its disk ; beneath fuscous, the sides of the 

 segments rather densely clothed with pale pubescence, a spot on each 

 side of the second segment, and a continuous band on the third, atte- 

 nuated in the middle posteriorly, whitish. Length 4 — i? lines; ex- 

 panse of wings 7 — 8 \ lines. 



Collection. — Ent. Soc. Philad. Four specimens. 



