AMERICAN flEMIFTERA. 39 



reiulily to separate the species of the latter subgenus l)y their form 

 and general appearance, it is sometimes very difficult to indicate in 

 words any salient points for distinguishing them. The characters 

 given in the key are the best I have yet been able to detect. When 

 living on tlie whitish vegetation characteristic of the parched prairies 

 of tlie arid regions, the colors become c(»rrespondingly pale. Under 

 other conditions, at least in Smjl and ligata, they become deep black- 

 ish green with the markings strongly contrasted. 



Pentalonia (Chlorocliroa) jiiiiiperina Liun. 



When fully colored, this is a beautiful insect, with its bright 

 crimson border about the clear green body. It is abundant in the 

 eastern States noith of New Jersey and in eastern Canada. How 

 far west in Canada it extends I have not yet been able to determine. 



Peiitatoina (Chlorocliroa) l^lileri Stal. 



This is perhaps the most abundant Peiitatoma found in Colorado 

 and the adjacent portions of the Rocky Mountain region. A long 

 series received from the Agricultural College at Fort Collins shows 

 a very marked variation toward jiuiiperina on the one hand and 

 ligata on tiie other. Either this is still a plastic group or species 

 that has not become well fixed or my material contains two or more 

 species I have not been able to delimit. The form I have considered 

 typical Uhleri is most nearly allied to juniperinu, but has a more 

 broadly ovate form, and the genital segment of the male is much 

 shorter on its ventral aspect; viewed from the side, this poition 

 projects but little beyond the dorsal portion. In this, as in all the 

 allied species, the retracted dorsal edge of this segment is feebly 

 sinuated with a minute median notch, and on the base below are 

 two distant, oblique, oval, blackish spots that are ordinarily quite 

 incons})icuous. 



In Hone Soc. Ent. Rossire, vol. 4, p. 99, 1867, Kouchakevitch 

 describes a Ctinex flavomargliiatas that I believe is the same as 

 Uhleri. If this proves to be the case, the latter name will have to 

 give way to flavomarginatus. For the benefit of those who have 

 not access to the paper by Kouchakevitch, I copy here his Latin 

 diagnosis, and append a free translation of his Russian notes that 

 was kindly made for me by Dr. Schroter of this city. I leave the 

 final determination of the synonomy of this difiicult species until a 

 more careful revision of the genus can be made. 



TEANS. AM. ENT. SOC. XXX. FEBEUARY. 1904. 



