240 E. T. CRESSON. 



and third segments lemon-yellow, sometimes tinged anteriorly with ferrugi- 

 nous ; apical margin of fourth segment narrowly yellowish-ferruginous : second 

 segment has sometimes an obscure ferruginous spot on each side; the yellow 

 posterior margin of the first segment has a very fine brown or black, longi- 

 tudinal, abbreviated line down the middle, and a transverse'one on each side ; 

 beneath, the segments have a narrow pale posterior margin, and a yellow spot 

 on second and third segments, largest on the second. Form robust, compact; 

 head and thorax densely and coarsely punctured, with as short, fine, gojden 

 pubescence; clypeus flattened, apex truncate; metathorax short, abrupt, 

 broadly excavated behind, lateral angles prominent; abdomen broad ovate; 

 first segment smooth, pale sericeous; remaining segments closely punctured, 

 more coarsely so on posterior submargin, which is depressed and subsinuous 

 on second segment. Length .45 — .55 inch. 



The % has the clypeus, anterior orbits, spot above antenna?, labrum, base of 

 mandibles, scape in front, coxae in front, most of legs in front, sometimes a spot 

 on each side of second abdominal segment, apical margin of fourth and fifth 

 segments beneath, lemon-yellow; sides of metathorax ferruginous, the upper 

 part yellow; sometimes there is a small yellow spot beneath anterior wing; 

 tip of antennas ferruginous, hooked. Length .45 inch. 



Described from three $ , two % , specimens. Allied in form and 

 somewhat in ornamentation to 0. Boscii, St. Farg. This also occurs 

 in Colorado. 



Odynerus geminns, n. sp. 



J. — Black, coarsely and confluently punctured, clothed with a short pale 

 pubescence, longer and more dense on apex of second and following abdominal 

 segments; clypeus and a large spot behind summit of eyes ferruginous; spot 

 above base of antennas, anterior orbits as far up as emargination of eyes and 

 and upper margin of clypeus, yellow; clypeus broad, flattened, sparsely punc- 

 tured, apex narrowly truncate; antennas black, scape dull ferruginous; pro- 

 thorax ferruginous, anterior margin narrowly yellow; scutellum with an ob- 

 scure ferruginous dot on each side; postscutellum lemon-yellow ; lateral angles 

 of metathorax yellow, posterior face deeply excavated, obliquely striated ; 

 pleura entirely black; tegulae ferruginous, margined with yellowish; wings 

 fusco-hyaline, darker along costa, violaceous, marginal cell fuscous; legs fer- 

 ruginous, coxae black, knees and tibiae beneath tinged with yellowish; abdo- 

 men subsericeous; first segment smooth, impunctured, a ferruginous stain on 

 each side, the apical margin rather broadly yellow, suddenly dilated on each 

 side; second segment shining, deeply, finely but not densely punctured, apical 

 margin much depressed especially on middle and coarsely punctured, narrowly 

 lemon-yellow, sometimes a small transverse fulvous spot on each side; re- 

 maining segments generally immaculate, coarsely punctured, sometimes the 

 third segment has a narrow margin at apex ; apical margin of all the segments 

 flat, not at all reflexed; venter black, a small yellow spot on each apical corner 

 of second segment. Length .50 inch. 



Three specimens. (Belfrage.) Closely allied to firmus, of which 

 it may prove to be a variety ; the pleura is however entirely black. 



