724 ZOOLOGY— INSECTS. 



103. MACEOTEEA ALBIPENNIS. 



rcrdita ? albipennis, Cress., Trans. Am. Ent. Soc, i, 380. 

 3 9 specimens; New Mexico; Dr. Oscar Loew. 



104. MONUMETEIA BOBEALIS. 

 Monumetlia borcalis, Cress., Proc. Eut. Soc. Phila., 1804, 388. 



1 ? specimen; Eastern Nevada ; 1872; Dr. H. C. Yarrow. 



105. MONUMETHA ARGENT1FRONS. 

 Monumetlia argentifrons, Cress., Proc. Ent. Soc. Phila., 1804, 387. 



1 <? specimen; Colorado; 1873; Dr. J. T. Rothrock. This is proba- 

 bly the £ of* borcalis. 



100. OSMIA BUCEPHALA. 



Osmia bucephala, Cress., Proc. Ent. Soc. Phila., 1804, 17. 



1 ? specimen; Colorado; 1873; Dr. J. T. Rothrock. 



107. LITHURGUS APICAL1S, up. nov. 

 ?. — Black; the face with a transverse ridge, with the sides elevated 

 into a prominent obtuse tubercle, and beneath a large, quadrate, flattened, 

 smooth, shining space, having a few large scattered punctures; at base 

 of antennae, down the sides of the face, and on the margin of the clypeus 

 covered with dense, whitish pubescence; that on the latter intermixed with 

 fulvous; cheeks, sides of thorax and of metathorax, and postscutellum 

 clothed with long, whitish pubescence; thorax convex, densely and rather 

 coarsely rugose; wings subhyaline; legs clothed with a pale pubescence ; 

 that on tarsi beneath fulvous; abdomen depressed, much flattened and ex- 

 cavated at base, shining, finely and closely punctured on the sides, smooth 

 on the disk of the segments, the apical margins of which have a narrow 

 band of white pubescence, generally interrupted medially; apical segment 

 above densely covered with a fulvo-fuscous pubescence; ventral scopa 

 dense and whitish. Length, 6-8 lines. 



2 9 specimens; Colorado, New Mexico; Dr. II. C. Yarrow, C. E. Aiken. 

 This is closely allied to gibbosus, Sin., also found in Colorado, but is readily 

 distinguished by the fulvous apex of the abdomen; in gibbosus, the apical 

 segment is black. 



