THE CANADIAN ENTOMOLOGIST. 263 



used in the examination of any specimens obtained from different species 

 of animals : — 



" Cimex hirundinis. — This species is rather less than C. cohimbarius, 

 and in respect to form different from both that and the C. ledularius. 



" The antennas are comparatively short, and the third joint is scarcely, 

 if at all, longer than the fourth. The eyes are not so prominent, the thorax 

 is much less hollowed out in front, the anterior angles but little produced, 

 and the sides scarcely at all reflexed. The scutellum is wider at the base 

 or more transverse, and does not project so far backwards. The elytra 

 are less coarsely punctured ; the abdomen is not so broad and more 

 rounded at the apex ; the sides regularly curved. The whole insect is 

 more pubescent. The colour is ferruginous inclining to testaceous, darker 

 than in the common bed-bug, and the head and thorax are much clouded 

 with fuscous. In one specimen the legs are spotted at or near the joints 

 with this last colour. There are also some fuscous spots on the abdomen. 



" The young or pupae have the abdomen much narrower than the 

 perfect insect, inclining to oblong. 



" Cimex pipistrellce. — The antennae of this species are of an inter- 

 mediate length between those of the C ledularius and those of the C. 

 colujnbarius, and the third joint is obviously longer than the fourth. The 

 eyes are prominent. The thorax has a moderately deep excavation in 

 front, and the sides are partially reflexed. The abdomen is narrower than 

 in either of the above named species, and much more attenuated poster- 

 iorly, the greatest breadth being rather before the middle. The thighs are 

 more incrassated. The whole insect is more pubescent approaching to 

 hispid, and rather coarsely punctured. The colour is dark ferruginous- 

 ochre, glistening with a faint metallic or sub-aeneous hue, not perceptible 

 in any of the other species. The legs and antennee are a shade paler than 

 the abdomen, and, as well as this last, without spots. 



" Cimex columbarius. — On comparing this species with the common 

 house-bug, it will be found to be smaller and of a more orbicular form. 

 The antennas are shorter, and the joints are not quite so slender, and the 

 difference in length between the third and fourth joints not so considerable. 

 The thorax is rather less hollowed out in front, the anterior angles less 

 produced, and the sides less reflexed. The abdomen more nearly 

 approaches to round, the lateral margins being very much curved, and 

 the greatest breadth exactly in the middle ; whereas, in the house-bug the 

 lateral margins are at first but little curved, and the greatest breadth rather 



