50 GEO. H. HORN, M. D. 



of the disc. The auteanae are very feebly annulated. In the typical 

 form the legs and antennas are black. 



The form noted in the table as var. texana, is larger than the others 

 and has the femora and scape red. 



Occurs from Michigan to Texas. 



T. canescens Lee. = annulatus Leo. 



The surface is usually paler in color than the other species and 

 rather densely clothed with fine cinereous pubescence, the erect hairs 

 are very short and are visible only at the sides and near the tip. The 

 thoracic umbone is abruptly elevated but less distinctly defined than 

 in /emoratiis. In all the specimens I have seen the lateral elytral 

 spot is absent. 



The sinuation of the upper margin of the mandible near the 

 base is sexual and is the only character by which the male may 

 be determined. 



Kansas, New Mexico and Texas. 



TETROPS Kirby. 

 Three species occur in our fauna. 



Elytra with greyish recumbent pubescence and erect pale hairs intermixed. 



Legs black canescens Lee. 



Elytra with black recumbent and erect hairs. 



Legs black, thoracic umbone distinctly elevated jiiciinda Lee. 



Legs red, umbone scarcely elevated monoistigiua Hald. 



T. canescens Lee, occurs in Kansas; Jucnnda widely distributed 

 but not common. Of 7nonosti<jma I have seen but one specimen 

 from the Middle States, which may be merely an accidental variation 

 o( Juctmda. 



AMPHIOSTYCHA Lee. 



I have already shown the confusion existing regarding this generic 

 name (Trans. Am. Ent. Soc. 1875, p. 150), and might add that the 

 Catalogus, Gemm. and Harold, does not make matters any better. 



Our two species are merely varieties of one and differ only in the 

 thorax oi' Jfammata being narrowly yellow at the sides and the same 

 color forming a very narrow margin at the sides of the elytra near 

 the base while in ardens the thoracic yellow space is broad and the 

 humeri and sides to middle of the elytra are also yellow. There is 

 every degree of variation. 



The synonymy therefore is : 

 A. flammata Newm. = marginata J (Fab.) Hald. = ardens Lee. 



