April, '09] ENTOMOLOGICAL XEWS 149 



tures of abdomen sparser; not so strongly covered with pubescence. 

 Length 8 mm. 



The $ is related to C. dilcctns Cress., but may be separated 

 by the following characters : 



Head and dorsulum not nearly so strongly sculptured ; basin around 

 lower ocellus and furrow from lower ocellus more distinct; mesoplurae 

 more strongly striated; posterior face of metathorax more distinctly 

 striated; punctures of abdomen finer. 



Crabro (Synothyreopus Ashm.) florissantensis n. sp 



$ . Length 7 mm. ; length of anterior wing 4.5 mm. ; length of ab- 

 domen 4 mm. Slender. Head closely, rather finely punctured with a 

 number of longitudinal stria? intermixed; at the top of each eye is a 

 smooth area. Ocelli in a low triangle; the distance between the two 

 lateral ones slightly less than the distance to the nearest eye margin. 

 Antennae moniliform; apical joint decidedly longer than preceding. 

 Clypeus slightly produced in middle, a small tooth at each side of this 

 projection. Pronotum rounded, neither carinate or dentate. Anterior 

 part of dorsulum finely, closely punctured with some large punctures 

 intermixed; posterior part of dorsulum distinctly longitudinally striated. 

 Scutellum very finely, longitudinally striated. Suture of mesoplurae 

 foveate; sides of mesoplurae impunctate, or very finely punctured. 

 Metanotum with a distinct longitudinal carina which extends on poster- 

 ior face, above these are a number of rather irregular striae. Poster- 

 ior face of metathorax bound by distinct ridges; divided in middle by 

 the carina above mentioned. Metaplurae finely, closely, transversely 

 striated ; at the top there are a number of strong striae. Anterior 

 trochanters not half as long as femora ; anterior femora, flattened and 

 strongly produced posteriorly, more strongly so at base, that produced 

 part at the posterior basal angle has a stout hook; shield of anterior 

 tibiae about a third wider than the length of the tibiae, about parallel- 

 sided for the first third of the way then it tapers to an obtuse point. 

 Venation normal. Abdomen long, slender, impunctate. Black; two 

 spots on pronotum, scutellum, postscutellum, two spots of all the dorsal 

 abdominal segments (forming a band of the first, fifth and sixth), 

 spot of apex of anterior femora, and a line on anterior tibiae yellow. 

 Apical third of shield brown, the rest greenish-brown, with many hya- 

 line, round spots. Clypeus with silvery pubesci-iuv. I It-ad and tin mix 

 covered with long black hair. Wings slightly dusky hyaline, venation 



pale brown. 



Habitat. Florissant, Colo., June 12, 1908, "on sand," (S. A. 

 Rohwer). 



