68 CERAMBYCID^E. 



Subfamily III. LEPTURIN^E. 



Head either gradually or abruptly narrowed posteriorly, with a 

 more or less distinct neck ; gula produced between the bases of 

 the maxillae forms a meutigerous process, which is, as a general 

 rule, very distinct and exceptionally only very short ; ligula mem- 

 branous or coriaceous, usually bilobed or emarginate. Antennae 

 inserted before or between the eyes, generally at some distance 

 from them, sometimes contiguous to their lower lobes. Prothorax 

 not marginate at the sides. Mesonotum usually with a stridulatory 

 area, which is sometimes absent, but when present it is in most 

 cases divided by a smooth median line or groove. Front coxae 

 prominent, usually somewhat conical in form, always laterally 

 produced, with their acetabula more or less strongly angulated on 

 the outer side. Acetabula of middle coxae widely open to the 

 epimera. Episterna of metathorax as a rule rather broad in front, 

 gradually narrowed posteriorly. First ventral segment of the 

 abdomen little or not at all longer than the second. Wing- 

 venation variable; sometimes of the type represented in fig. 5 

 (Intro.), more often a modification of that type in which the cell 

 has disappeared from the first anal vein. 



The Lepturince can be with little difficulty distinguished from 

 both the Prionince and Disteniince, but the differences between the 

 Lepturince and the Cerambycince are less strongly marked, at least 

 in the imago ; in certain doubtful cases it is not easy to decide 

 to which of the two a genus should be referred. One of the chief 

 reasons for regarding the Lepturince as a subfamily distinct from 

 the Cerambycince is to be found in the structure of their larvae. 

 In these the pleurae or side-pieces of the head are dehiscent 

 behind the epistoma (or clypeus) and angulated at the end, 

 whereas in the larvae of Cerambycince they meet together up to 

 the apex and are separately rounded behind. In the Lepturine 

 larvae also, the head is less invaginated in the prothorax and the 

 legs are more slender and not so short as they are in the larvae of 

 other Longicornes. Unfortunately however, as the larvae of only 

 a relatively small number of the different forms are known, these 

 structural characters can seldom be resorted to in order to decide 

 upon the affinities of a genus. 



Synojisis of the Genera. 



A. Eyes coarsely facetted. 



a. Winged in both sexes ; metathorax nor- 

 mal ; eyes usually large and more or 

 less emarginate. 



a'. Prothorax tuberculate or spined at 

 the sides ; antennae not contiguous 

 to eyes. 

 a' 2 . First antenna! joint not reaching 



to front margin of prothorax. 

 <t 3 . Antennae serrate, shorter than 



the body in 5 APATOPHYSIS, p. 69. 



b 3 . Antennae not serrate, longer 



than the body in $ PEITHONA, p. 71. 



