NO. 2202. GIFFARD COLLECTION OF nYMENOPTERA—ROHWER. 237 



denm, apical margins of the first and follo^Ying tergites, lateral mar- 

 gins of the first and second tergites connected with the triangular- 

 f.linped spot, second and following sternites yellow; legs yellow; 

 coxae above, trochanters, femora above and also beneath at base, 

 black; tarsi ferruginous; head and thorax with short broAvnish hair; 

 wings yellowish hyaline, the apical margin slightly dusky; costa 

 and stigma yellowish, the apical venation brown. 



Male. — Length to apex of the second tergite 9 mm. The male 

 agrees very well with the female in color and structure. The clypeus 

 is entirely yellow. 



Type-localit]/. — Tahoe, Eldorado County, California. Described 

 from one female and four males collected at an altitude of G,200 feet, 

 in June, 1900, by W. JSI. Giffard. 



Type.— Cat No. 20332, U.S.N.M. 



Two paratypes in collection of Mr. Giffard. 



Specimens Avhich are probably this species are also collected at 

 Summit, in Placer County, California. These specimen and a few 

 ether specimens from Eldorado County which are not considered 

 as types indicate that this species will vary considerably in the mark- 

 ings of the scutellum and propodeum ; most of the males have the 

 scutellum and propodeum black; the marking of the second tergite 

 varies somewhat, as the median yellow spots are much reduced in 

 fcize in certain specimens from Summit. 



ODYNERUS GIFFARDI, new species. 



This species would fall near hlandus in Saussure's Synopsis, but is 

 easily separated from that species on the puncturation of the ab- 

 domen, and from the species described above by the yellow spot on 

 the mesoscutum. 



Female. — Length to apex of the second tergite, 7 mm. Clypeus 

 longer than wide, irregularly striate, the apical margin truncate; 

 front confluently punctured; vertex not tuberculate; thorax with 

 distinct well-defined punctures, laterally bipunctate; propodeilm 

 reticulate above, posterior face striate, without defining carinae; 

 first tergite about half as long as second, with distinct, scattered 

 punctures; the second tergite with only setigerous punctures basally 

 and with a few punctures apically, the apical margin not reflex. 

 Black; clypeus except a median spot and the lateral and anterior 

 margins, spot between the antennae, the inner margins of the eyes 

 to the emargination, scape beneath, spot at the summit of the eyes, 

 tAvo spots on the pronotum, tcgulae, a large spot beneath, a small dot 

 in front of the scutellum, metanotum, large spots on the sides of the 

 propodeum, apical margin of all the tergites, triangular-shaped 

 lateral spots on the first and second tergites which are confluent with 



