249 



THE BRITISH NATURALIST. 



TDecember 



elongated, and may be nearly entire at the extremity f/^w/ai^Ms, disparj, 

 or the tip may be notched fflavoguttatiisj, forked (atomits), or the 

 segment may be cleft into two very slender filiments [marginatus, 

 mvsticus, etc.) Occasionally in the same genus some of the dorsal 

 segments are also modified in the male, even to the extent of being 

 furnished with hooks at the hinder edge of the antepenultimate one f(i25j!)«?' 

 and flavoguttatus ). A great many of the group Longicornia have the 

 fifth ventral segment of the male truncate, while the same segment is 

 rounded or truncate in the female {Aromia, Callidhim variabilis, 

 Rhagium, PogouocJienis, etc), while m Acaiithocinus this segment is 

 notched in the male and prolonged in the fem.ale. In Leptiira vivens 

 the fifth segment is notched in the m.ale, while in the allied L. fulva 

 the. same segment is furnished with two teeth. The same segment 

 genera undergoes various sexual modifications in some members of the 

 Donacia, Cryptocephaliis, and Tliyamis. The females of Cryptocephalus 

 according to Fowler, usually have a large fovea on the last ventral 

 segment in which the egg is carried previous to its deposition on a 

 plant. The males of some species of CJirysomela have the last ventral 

 segment swollen (sangitiiioUiita ) or convex (graminis, didymata, etc), 

 while those of mentliastri and hcBinopteva have a small fovea in the same 

 segment. The male Phyllohrotica has the third and fourth segments 

 triangularly impressed, and the fifth very large and channelled in the 

 middle. In Tliyamis the fifth ventral segment of the male is usually 

 furnished with an impressed line, a depression, or a smooth space, or 

 even a tubercle. The males of Blaps movtisnga and similis have a 

 tuft of yellow or red hair at the apex of the first ventral segment. 

 Nacerdes luelmiura has the last segment of the male with a deep 

 triangular notch. The males of some of the genus Anaspis, {frontalis, 

 fovcipatn, luelanopa, etc) have long slender processes attached to the 

 underside of the third segment of the abdomen, varying somewhat in 

 shape and in length in the different species. In some species there is, 

 according to Crotch, a tendency to the formation of similar processes 

 in connection with the succeeding segment. The male of Scolytus 

 ratzhurghii has a tooth at the front margin of the third and fourth 

 segments, that of 5. multistriatus has a large tooth on the second 

 segment beneath ; CcutJiorrJiyiicJncs sulcicollis has the last segment but 

 one furnished with two small tubercles m the male, and the last 

 segment has a depression bounded behind by a ridge, while in the 

 allied C. alliavioi the male has no tubercle on the penultimate, and 

 the last has a hollow succeeded by a tubercle. The males of most of the 

 Centhovrhynchidei have the last ventral abdominal segment impressed 

 or foveate. Otiorrhyncluis tenehvicosiis and fnscipes have tlie segment 

 deeply scratched in the male, smooth or punctured only in the female. 



