REHN AND HEBARD 135 



westward apparently passing into A. graciUpes s.s., in western 

 Kansas and west-central Texas, specimens from as far west as 

 Clark County, Kansas and Uvalde and Carrizo Springs, Texas 

 representing constricta. The specimen from ]\Iontelovez, Coahuila, 

 Mexico is included with this form, although being from alcohol 

 we feel some uncertainty regarding its real position. 



The highest known elevations from which we have seen the 

 present race are 1950 feet in Clark County, Kansas and 1526 to 

 1725 feet at Kerrville, Texas, while at Tonala and Brownsville its 

 distribution almost touches sea-level. 



Biological Notes. — Isely took the present form in open prairies 

 east of Fairmount, Kansas. The present authors have taken it in 

 numerous situations in Texas; in short grass in open spots between 

 oak thickets (Dallas and Beeville), in the very short and sparse 

 vegetation on out-crops of shell-limestone (Weatherford), among 

 green weeds in rather moist bottom land (Uvalde), in dry sorghum 

 (Laredo), in long dry grass along railroad tracks (CHp), in fields 

 more or less thickly overgrown with grasses and low plants (Vic- 

 toria and Benavides) and also beaten from oak (Cisco). One im- 

 mature female taken at Brownsville by Mathewson is labelled 

 "on huisache" {Vachellia farnesiana). It thus can be seen to fre- 

 quent a variety of habitats, although in our experience most numer- 

 ous in well grassed fields dotted with low bushes and plants. 

 In such situations at Victoria it occurred in company with .4. gral- 

 lator and at Benavides with A. phantasma. 



The earliest date for an adult of this race is May, at Browns- 

 ville, the next June 11, at Wichita, Kansas, the latest, October 4, 

 at Shovel Mount, Texas. A female individual in the instar pre- 

 ceding maturit}^, from Brownsville, Texas, taken May 23 has been 

 examined by us. 



Morphological Notes. — The general form of the pronotum varies 

 slightly in character in the present race, but its features as differen- 

 tial from A. graciUpes s.s., remain constant. A certain amount of 

 artificial dilation and compression of the pronotum, due to pressure 

 when pinning, is occasionally noticed, but the former is easily 

 recognized as such when compared with the bullation found in the 

 typical form of the species. The caudal margin of the pronotum 

 varies from rectangulate to distinctly acute-angulate, the margins 

 laterad of the angle frequently subarcuate and again the apex acute- 



TRANS. AM. ENT. SOC, XL. 



