ACANTHIID.&. 511 



are shorter, and the joints not quite so slender, and the difference 

 in length between the 3rd and 4th joints is 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 behind the middle. The 

 colours, as well as the punctures and the degree of pubescence, 

 are similar in the two species. 



" Very lately I have been favoured by Mr. Westwood with spe- 

 cimens of this species found on pigeons, which, though often met 

 with before, has not been generally considered as distinct from the 

 one found in houses." 



Species 3. ACANTHIA HIRUNDINIS. 



CIMEX HIEUNDINIS, Jenyns, An. N. H. iii, 243, 244, 3, pi. v, fig. 2 

 (1839). 



" Fusco-ferrugineus ; thorace leviter emarginato, lateribus planis ; 

 abdomine ovato, apice subacuto ; antennis brevibus, articulis 

 tertio et quarto subsequalibus. 

 " Long. If lin. Hab. in nidis Hirundinis urlicce. 



11 This species is rather less than the C. Columbarius, and in re- 

 spect to form, different from both that and the C. lectularius. The 

 antennae are comparatively short, and the 3rd joint is scarcely, if at 

 all, longer than the 4th. 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 scu- 

 tellum 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 ferru- 

 ginous, 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 



