152 KANSAS UNIVERSITY SCIENCE BULLETIN. 



T. sericatus is not represented in the collection by a male. This sex 

 resembles ohscurus a good deal, but the sericeous pubescence is more 

 abundant in sericatus. 



Tachytes validus Cress. 

 Tachytes validus Cresson; Trans. Am. Ent. Soc, IV; 1872. r g . 

 Tachytes validus Fox; Trans. Am. Ent. Soc, XIX, 237; 1892. ^ j . 



2 ■ Stout and broad. Clypeus with a quadrate median production, 

 three small lateral ' teeth ; third joint of antennae longer than fourth: 

 vertex with rather strong separate punctations; scutum very finely 

 punctate; scutellum scarcely impressed; disc of propodeum wdth a slight 

 impressed line, a subcircular subapical fovea, and a strong median 

 sulcus on posterior face; hind tibiae with moderately stout spines; abdo- 

 men rather broad, depressed; pygidium convex, depressed along the 

 sides of its apical portion. Black; legs, except coxae, trochanters and most 

 of femora, yellow-ferruginous (sometimes this color is more widespread) ; 

 wings pale yellowish-hyaline, venation ferruginous; pygidium with fine 

 silvery pile. Pubescence of head and thorax pale golden; abdomen with 

 four silvery fascise. Length, 18-22 mm. 



T . More slender as a rule than g . Joints 1-5 of flagellum strongly 

 rounded out beneath; scutellum with a distinct median impressed line; 

 eighth ventral plate rather nai-rowly emarginate. Length, 15-19 mm. 



One o , labeled "Kans.," identified by E. T. Cresson, December, 1878. 

 The abdomen is lacking in this specimen. 



Tachytes mandibularis Patt. 



(Fig. 40, antenna; 52, clypeus; 90, pygidium, g ; 108, eighth ventral 



segment, j .) 

 Tachytes mandibularis Patton; Proc. Bo:t. foe. Nat. Hist., XX, 394; 



1880. ^ 2 ■ 

 Tachytes mandibularis Fox; Trans. Am. Ent. Soc, XIX, 237-238; 



1892. ^ 2 ■ 



g . Stout. Clypeus with the median process narrower than in vah- 

 fliis, three distinct lateral teeth; third joint of antennae somewhat longer 

 than fourth; vertex finely and closely punctate; scutum likewise; scutel- 

 lum scarcely impressed; disc of propodeum with a wide median sulcus or 

 furrow, a subtriangular fovea before apex, posterior face with a strong 

 median furrow; spines on posterior tibise rather slender; abdomen broad, 

 somewhat depressed; pygidium subpyriform, somewhat narrowed before 

 apex, the short bristles not concealing the disc. Black: basal half of man- 

 dibles, scape beneath, apex of femora, tibiae and tarsi, ferruginous; wings 

 pale yellowish hyaline, venation pale brown; pygidial area with bronzy 

 bristles. Pubescence dense, rather dull golden; abdomen with four silvery 

 fasciae. Length, 14-17 mm. 



T . Anterior margin of clypeus drawn out mesad, a large distinct 

 lateral tooth; joints 1-5 of antennas rounded out beneath; hind tarsi not 

 spinose; eighth ventral segment rather broadly emarginate. Length, 12- 

 14 mm. 



