(93) 



NOTES ON THE STRUCTURE OF THE SEXUALLY MODIFIED 

 SEGMENTS OF THE CI3IICIDAE { = CLINOCORinAE), 

 WITH SPECIAL REFERENCE TO CLINOCOBIS COLUM- 

 BABIUS (JENYNS). 



By the HON. N. CHARLES ROTHSCHILD, M.A., F.L.S. 



(Text-figs. 1-9.) 



SINCE the paper by Landois in LS68,* dealing with the anatomy of the abdomen 

 of the common Bed-bug {Clinocoris lectitlarii/s), in which the sexually modified 

 segments are insufficiently treated of or incorrectly described, no treatise bearing 

 on the subject of these present notes would appear to have been published. The 

 investigations of the present author on the Cimici(hii> (= CUnocnridae) seem to show 

 tiiat the general type of structure of the sexually modified segments is common to 

 tlie various species and identical in some of them, and the characteristics of these 



Fig. 1. 



Fig. 2. 



Fio. .S. 



Fig. 4. 



segments do not therefore, as in the Siphouapfera (fleas), always aftbrd a delicate 

 test for the differentiation of closely allied species. In the following notes the insect 

 principally dealt with is not the common Bed-bng {CI. lectidarius), but the Pigeon- 

 bug {('I. columburius), a closely allied species, of which we have recently received 

 a fine series from Mr. E. Thornhill, of l$o.\worth, C'arabs. Incidental references are 

 made to other species, where jjoints worthy of mention have been noticed. 



lu both sexes of bugs the eighth segment is sexually modified, and in the male 

 both sclerites are aft'ected, each being more or less unsymmetrical ; while in the 

 female (and in the female only) the sevrnth segment is also modified, the sternite 

 being affected, while the tergite like the eighth appears to be normal. 



All the segments of these insects are partially covered with hairs. As certain 

 of these hairs are characteristic of the Cimicidae, a short descrij)tion of the four 

 types of them which are found is introduced here. These types, however, inter- 



* Zntsehr.f. Wissensch. ZuoUgie, vol. xi.t. pp. 207-29. pis. IS and 19 (18G8). 



