NORTH AMERICAN COLEOPTERA. 177 



Very recently some specimens were sent me from Texas, which from 

 their appearance I had supposed to be new, and within a few days others 

 were sent me by Mr. Merkel for examination which fill the series com- 

 pletely iu the color variation. 



One specimen before me has the elytra dirty yellow without marks 

 and excepting the thoi'ax looks not unlike the males of intermedius ; a 

 second specimen has the short humeral black vitta. The form with the 

 short apical continuation of the humeral vitta is in LeConte's cabinet. 

 There is in Mr. Merkel's collection a specimen with the suture narrowly 

 piceous and the humeral line continuous in a narrow vitta nearly to the 

 tip. Three specimens in my cabinet show the gradual widening of the 

 sutural stripe and the discal vitta until the elytra become almost entirely 

 black with merely the lateral margin and an abbreviated discal vitta yel- 

 low. 



The thorax has the two callosities always distinct, but as the elytra 

 become darker there are five callosities indicated by the black spots placed 

 as in Tylosis with the addition of two smaller antero-lateral spots. 



In the Biologia (v, p. 82) Mr. Bates describes a closely allied species 

 friviffafvs, if indeed it is not identical. The faint elytral costae, of which 

 Mr. Bates makes especial mention, are plainly shown in several of our 

 species, and very distinct in testaceus. 



STENOiiiPHENUS Hald. 



In a recent study of the specimens which have accumulated in my 

 cabinet six very distinct species were found to be present. With the 

 exception of two which were well known, the others were supposed to be 

 the equivalents of those enumerated by Mr. Bates in the Biologia. This, 

 however, seems not to be the case, and I am quite sure that the species 

 to which the name crihripennis had been attached is not that species. 



The diiFerence in the sculpture of the prosternum of the two sexes 

 does not seem to have been observed. In its high(!st development the 

 character consists of a depressed space extending from one side of the 

 prosternum to the other which is densely coarsely or even cribrately punc- 

 tured, in the male. This space does not extend to the apical margin, and 

 in several species is divided in two by a smooth space extending from the 

 apical margin to the tip of the prosternum. In the females the pros- 

 ternum is either sparsely punctate or almost smooth. In *S'. notatns, 

 however, there does not seem to be any difference between the two sexes. 



TRANS. AMER. ENT. SOC. XII. (27) MAY, 1885. 



