42 Mr. Joseph S. Baly on the 



D. simulans, Baly, I.e., p. 222; D. Simoni, Jacoby, var., I.e., 

 1889, p. 280, 



Hah. Brazil, Tejuca, Petropolis {Gray) ; St. Catha- 

 rine (ex col. Dcyrollc) ; Tucuman, type and var. A 

 {Lord Dormer) ; Peru, Chanchamayo, vars. A and B 

 {Thamm) ; Bolivia, vars. B, C; Cayenne, var. A; 

 Amazons, var. A {Bates) ; Colombia, vars. A, C, and D 

 {Stcinheil) ; Mexico, var. B. In most collections. 



Head not longer than broad, triangular ; clypeus with a broad 

 longitudinal ridge ; antennae shorter than the body in both sexes, 

 filiform, the second and third joints short, nearly eqiial, the fourth 

 slightly longer than the preceding two united. Thorax slightly 

 broader than long ; sides nearly parallel and slightlj^ sinuate from 

 the base to bej^ond the middle, thence obliquely converging towards 

 the apex, hinder angles subacv;te ; upper siu'face moderately con- 

 vex, smooth, impressed more or less distinctly on either side with 

 a round fovea, which is iia some specimens ill-defined and in many 

 instances entirely obsolete. Elytra ovate, dilated posteriorly, 

 their apices rounded ; above convex, not plicate below the humeral 

 callus, finely but rather closely punctured. 



This common and variable species is found in nearly 

 all the warmer parts of the South American continent 

 and also in Mexico and other parts of Central America ; 

 it varies greatly in the coloration of the head, under 

 surface of the body and in the presence or absence of 

 the yellow markings on the elytra ; these markings, 

 svhen present, appear to differ but little in form. The 

 foveffi on the thorax, as stated above, vary from being 

 well-defined to entirely obselete, every stage being found 

 between the two extremes. Having nearly one hundred 

 specimens of the different forms, both in sculpture and 

 coloration, now under my observation, I cannot but 

 regard them as varieties of the same species, therefore 

 am compelled to unite them under a single head. 



Mr. Jacoby, in his diagnosis of I). Simoni, gives the 

 thorax in the ? as being marked with four piceous 

 spots. I have several specimens in my collection in 

 which the thorax is more or less distinctly marked with 

 piceous or fulvous, evidently the result of fading after 

 death. 



