FRANK E. BLAISDELL, SR. 313 



In testacea there can be no doubt regarding the scutellum, for 

 it is larger than in the other species and ahnost an equilateral 

 triangle. 



In the other three species the bottom of the scutellar depres- 

 sion is transversely flattened. The scutellum when cleaned and 

 viewed with moderately high power appears to consist of three 

 parts, a middle or triangular part (true scutellum) and a lateral 

 portion or callus on each side, which is a modification of the 

 elytral margin bounding the scutellum, and fitted to the oblique 

 sides of the central triangular part so as to. give the appearance of 

 a continuous transversely oblong scutellum, which appears dis- 

 tinctly bisinuate and tridentate at apex from lateral angles of the 

 side pieces, and the middle angle or apex of the true scutellum. 

 This appears to be the true explanation, and does not affect the 

 status of the species. In testacea the parascutellar pieces are not 

 present. 



In all the species the elytral base is impressed or notched be- 

 tween the humeri and the more or less prominent sides of the 

 scutellar depression, corresponding to similar notches at base of 

 the pronotum, between the basal prominences and basal angles. 



TRANS. AM. ENT. SOC, XLV. 



