270 E. T. CRESSON. 



Megachilc variolosa, n. sj>. 



9. — Very small, long, parallel, much the general form of osmoides, bat 

 much smaller and more coarsely punctured, head smaller, not unusually en- 

 larged behind eyes; punctures of thorax large, the pubescence much as in pre- 

 ceding species ; wings faintly dusky, darker at tips ; legs with thin white pubes- 

 cence ; abdomen shaped and clothed as in osmoides, except that the apex is not 

 clothed with a pale pile, first and second segments with fine, rather close punc- 

 tures, on third and fourth segments the punctures are suddenly large, being 

 double the size of those on the two preceding segments, on fifth segment they 

 are smaller and on apical segment small and very dense; ventral scopa white. 

 Length .20— .25 inch. 



Two specimens. (Belfrage.) 



Anthidium zebratnm, n. sp. 



<£,. — Differs from % occidentalis, Cress., only as follows: — Large and more 

 robust, the pubescence on head and thorax more yellowish; pro- and meso- 

 thorax immaculate; scutellum with two pale yellowish spots; abbominal 

 fascia? broad laterally and gradually narrowed in the middl ' mar- 



ginate. Length .55 inch. 



One specimen. (Heiligbrodt.) This also occurs in Colorado. 



Anthidium interroptum. 



Megachile interrupta, Say, Long's 2d Exped. ii., p. 352. 

 Anthidium curvatum, Smith, Brit. Mus. Cat. ii., p. 215. 



Two % 9 specimens. (Belfrage.) 



Anthidium eoncinnum, n. sp. 



9- — Black, densely punctured; sides of face, narrow anterior orbits and a 

 short line behind summit of eyes, yellowish; sides of face clothed with a pale 

 ochraceous pubescence; thorax more densely punctured than head, finely so 

 on the middle which has a well impressed longitudinal line; a spot on each 

 side of mesothorax anteriorly, a spot on each basal corner of scutellum, its 

 posterior margin slightly interrupted medially, and the tubercles, yellow; 

 postscutellum, sides of metathorax and pleura clothed with a pale ochraceous 

 pubescence, short and pale on pleura ; tegulse ferruginous, with a large yellow 

 spot anteriorly ; wings fuliginous, paler centrally and at extreme base, a dark 

 streak through marginal cell; legs entirely fulvo-ferruginous, sericeous with 

 pale hairs, tarsi with short yellow hair, tibise yellowish at extreme base; abdo- 

 men marked as in simile, Cress., the markings being less heavy, and of a pale 

 lemon-yellow color, and the surface more closely punctured; ventral scopa 

 fuscous. Length .35 inch. 



%.— Clypeus and mandibles yellow; basal segment of abdomen tinged with 

 ferruginous, fifth segment with a band similar to that on preceding segment, 

 disk of sixth segment stained with yellowish ferruginous, apical segment pale 

 yellowish, trilobate at apex, middle lobe small. Length .35 inch. 



Three specimens. (Belfrage.) Much like simile, Cress. (Proc. 

 Ent. Soc. Phil, ii., p. 378), differing principally by the color of the 

 has. 



