338 PROCEEDINGS OF THE ACADEMY OF [1897. 



From the Colorado 0. fulgida 1 and viridis, 0. bruneri will be 

 known by the green tegulse, and the partly light pubescence of tho- 

 rax. It may possibly be the unknown female of 0. bella, but there 

 is no way of determining whether this is the case at present. 



Hub. — Colorado Springs, Colo. (L. Bruner, no. 19). 



Osmia inurbana Cresson, 1878. 



$ . 7 to 11 mm. long; dark brassy-green. Sixth segment of abdo- 

 men distinctly notched,. Pubescence rather copious, tinged with och- 

 reous on dorsum. 37 examples, Olympia and Seattle, Wash. (T. 

 Kincaid). There is some variation, but they seem to be all one spe- 

 cies ; the extremes of size are connected by intermediates. The 

 Seattle specimens were taken on April 17th and 18th, one in May ; 

 eight are from Seattle, the rest from Olympia. The Olympia dates 

 run from April 20th to May 25th. One was on Fragaria April 

 25th. A Colorado inurbana, sent by Mr. Fox, is like our medium 

 sized examples. 



Osmia odontogaster n. sp. 



$. Length 9 to 10 mm.; stoutly built, head of ordinary size, 

 abdomen suboval ; dark brassy-green, metathorax bluer ; pubescence 

 tolerably dense, ochraceous on head and thorax, very dense and cream 

 color on clypeus, nowhere mixed with black, nigrofuscous on inner 

 sides of basal joints of middle and hind tarsi, ochraceous on base 

 and apex of abdomen, short and fuscous on second, third and fourth 

 segments, and on the basal portion of fifth, varying to griseous ; 

 third and following segments more or less distinctly fringed with 

 pale or ochraceous hairs; punctuation of head and thorax strong 

 but extremely dense, becoming sparser on middle of scutellum, which 

 is thus a little shiny ; basal area of metathorax with its lateral in- 

 ferior margins shining ; punctuation of abdomen less dense, ordinary, 

 leaving the surface shining. 



Face rather long and narrow ; antennre of only moderate length, 

 flagellum dull rufous beneath ; clypeus ordinary ; mandibles with a 

 large pointed terminal blade, and a broad rounded inner tooth ; 

 tegula3 black, shining, punctured ; wings smoky-hyaline, a little 

 darker on apical margin, no distinct cloud or streak in marginal 

 cell ; second submarginal somewhat shorter than the first on cubital 



1 A fulgida from Colorado, sent by Mr. Fox, has the thoracic pubescence 

 pale brownish, probably faded. It is, however, a much narrower and longer 

 insect than bruneri, the abdomen being of the elongate parallel-sided type, 

 whereas bruneri has it of the oval type. 



