AMERICAN HEMIPTERA. 6 



its regularly oval form and its more highly polished surface, with 

 fewer and almost obsolete punctures. I have taken it as far west as 

 Kansas. It ranges in Canada from Quebec to Manitoba. 



Coi'iiiielteiia nilidiiloidew Wolfl' (histeroides Say). 



Compared with unicolor, this species is obviously more narrowed 

 posteriorly; it will average a little smaller; the edge of the scutel- 

 lum at base is a little more deeply excavated, and the coriaceous 

 portion of the elytra is perhaps a little broader and more thinned 

 out inwardly than in unicolor. In niUduloides the punctures are 

 deeper and closer, so the upper surface although shining black wants 

 the higlily polished look so noticeable in unicclor. In unicolor the 

 antenn?e are longer and stouter, with the apical two joints darker 

 than in nitididoides. In the males the sixth ventral segment is 

 extended forward in a more acute angle in unicolor, and in the 

 females of that species the basal plates of the genital segment are 

 distinctly longer on the middle; in niUduloides they are cut almost 

 .square across. 



This species seems to be more characteristic of the western fauna, 

 although it is found occasionally throughout the east. Among the 

 foot hills near Port Collins, Colo., last summer, Prof. Gillette and I 

 took it in great numbers from a low weed, Plantago Purshi. They 

 were resting on the tiower spikes in all stages of development. Per- 

 haps one half of these were covered with a dusky '" bloom " that 

 washes off with benzine, and when present gives them a dull bluish- 

 black appearance. This condition may be owing to an accumula- 

 tion of the pollen of the plant on the surface, but it seems to me 

 more likely that it is connected with the breeding season, as is the 

 " bloom" often found on certain species of Euschistus. This spe- 

 cies extends its range into Mexico and Guatemala, according to Dr. 

 Distant. 



<'oriineliena uitiduloides var. 



I have in my collection two examples of what I prefer for the 

 present to consider as a variety of this species. It is smaller, more 

 highly polished, and witU the punctures less distinct. The head 

 is depressed before the middle, leaving the apex distinctly recurved, 

 and the outer sector on the corium is almost parallel to the subcostal 

 nervure. I t(K)k one specimen near Buffalo and the other in New 

 Jersey. 



TBANS. AM. ENT. SOC. XXX. JANUARY. 1904. 



