ROLAND HAYWARD. 201 



It is very widely distributed. Specimens have been examined 

 from Canada, Massachusetts, New York, Pennsylvania, North and 

 South Carolina, Florida, Michigan, Tennessee, Wisconsin, Iowa, 

 Arkansas, Nebraska, Arizona, California and Washington. 



Group IV. incurvus. 

 Form usually more or less convex. Head not inserted in the 

 thorax to the eyes; mentum without forameniform punctures; an- 

 tennas with the second and third joints subequal. Thorax narrowly 

 margined, the margin not translucent. Elytra rounded at tip with 

 two dorsal punctures, these placed on the third stria when the latter 

 is present, the second at or slightly behind the middle; recurved 

 portion of the sutural stria short and nearly parallel to the suture, 

 not hooked at tip; marginal stria broadly interrupted at middle. 



In the males the first two joints of the anterior tarsi are more or 

 less dilated. 



The largest group of the genus as regards number of species. 

 Many resemble each other quite closely and are not capable of easy 

 definition, although several retain a characteristic facies difficult of 

 expression in words. The members of the group are easily recog- 

 nizable by the characters given in the table for the definition of 

 groups. The arrangement of the dorsal punctures and the sutural 

 stria are illustrated on Plate VI, fig. 4. 



It will be observed in more than one-half of our species that the 

 median line of the thorax terminates on the posterior transverse 

 impression in a large puncture, while on each side at a short dis- 

 tance from it is another of about the same size. Such are described 

 as having " the posterior transverse impression tripunctate at mid- 

 dle." In the others these punctures are lacking. This character is 

 shown on Plate VI, figs. 10 and 11. It seems a good one for the 

 separation of several species otherwise closely allied. 



In all our species the frontal grooves are short, not extending 

 posteriorly behind the noddle of the eye. 



The elytral striae are impunctate in all except ferrugineus, in 

 which the sutural stria is punctulate. Their number varies in the 

 different species, but I am inclined to think that some authors have 

 placed too much reliance on this character. I have accordingly 

 made use of it only when accompanied by others. 



The following table is offered with the hope that it may assist the 



TRANS. AM. KNT. BOC. XXVI. f 26) JANUARY, 1900. 



