572 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



Rocky Ford, Colorado. One female collected June 4, 1904. Col- 

 lector unknown. Named in honor of Prof. C. P. Gillette. 



Type. — Colorado Agricultural College. 



In Fox's table this seems to be nearest to T. amplus Fox (New 

 Mexico and Nevada), but that species does not have the occiput 

 emarginate, the sculpture of the mesonotum is different, and the 

 venation is not testaceous. Disregarding the space between the 

 eyes at the vertex, it is close to T. semirufus (Cresson),but it is larger, 

 more robust, the venation is not black, the mesonotum and pygidium 

 are somewhat different. 



TACHYSPEX COQUILLETTI, new species. 



Related to amplus Fox. The female may be separated from this 

 species by the smaller size and the different dentation of the clypeus. 



Female. — Length 8 mm. The depressed margin of the clypeus 

 crenulate, with five broad, rounded teeth, the lateral teeth subangulate ; 

 surface of the clypeus shining, with small separate punctures; front 

 with close distinct punctures, those of the vertex larger and sparser; 

 interocellar area strongly parted, the vertex not so strongly so; 

 space between the eyes at the vertex subequal with the third antennal 

 joint; antennas hardly antennuate, the third joint slightly shorter 

 than the fourth; mesonotum and scutellum rather coarsely granular, 

 scutellum not parted; propodeum sharply truncate posteriorly, the 

 dorsal and posterior aspects separated by a carina, dorsal aspect 

 granular, sides striato-granular, posterior face striate; legs rather 

 strongly spined; inner calcarium of the posterior tibiae shorter than 

 the hind basi-tarsis; second cubital cell longer on the radius than 

 the third; abdomen shining, practically impunctate; pygidium poorly 

 defined, not one and a half times as long as the basal width, broadly 

 rounded apically. Black; tegulae testaceous; abdomen and tarsi 

 red or reddish; tibial and hind femora piceous; head, thorax, and legs 

 with dense silvery pile; wings hyaline, iridescent; venation pale 

 brown. 



Male. — What may be the male hardly differs from Fox's descrip- 

 tion of the male of amplus, and until a specimen of amplus male has 

 been examined can not be separated. 



Los Angeles County, California. One female and two males 

 collected by Mr. D. W. Coquillett, for whom the species is named. 



Tijpe.—Csit. No. 13755, U.S.N.M. 



TACHYSPHEX ARGYROTRICHUS, new species. 



Male. — Length about 8 mm. Clypeus subtruncate, with a small 

 lateral tooth, basal portion finely, closely punctured ; front and vertex 

 finely, closely granular; no impressed line from the anterior ocellus; 

 occiput flat; space between the eyes at the vertex about the same 



