CERAMBYCID^E 317 



rugose, dentate within and wholly without indication of the apical 

 inward flexure of the normal male. This indicates that the male 

 mandibles vary in development, as in so many Prionids and else- 

 where when a special part not of direct sexual utility is unusually 

 developed sexually. 



Lissonotus Dalman. 



Here again the species adhere very closely to a common type of 

 structure and ornamentation, so that characters, generally of sub- 

 ordinate value, become enhanced in much the same way as those 

 serving to distinguish the genera in this part of the series. The 

 following is probably the smallest known species: 



Lissonotus lucanus n. sp. Much more slender than usual, strongly 

 convex, deep black throughout and polished, almost glabrous; eyes 

 separated by about their own width, the front very finely, sparsely punc- 

 tate; antennae ( 9 ) three-fourths as long as the body, strongly compressed 

 and compact as usual but relatively narrower, the subapical joints fully 

 as long as wide, except the tenth, which is a little shorter than wide; pro- 

 thorax longer than usual, two-fifths wider than long, almost evenly 

 rounded at the sides and without the submedial protuberance of the other 

 species, finely, very remotely punctate, the larger scattered punctures 

 also small and inconspicuous, the punctures on the flanks sparse and much 

 less conspicuous than usual, though strong, the erect hairs of the flanks 

 much less numerous; scutellum acutely triangular, one-half longer than 

 wide; elytra narrowed rapidly from the base, the apices narrowly rounded. 

 Length (9 ) 12.0 mm.; width 4.0 mm. Lower California (San Jose del 

 Cabo). 



Differs from multifasciatus, examples of both sexes of which I 

 have from Guerrero, in its much smaller size and more slender form, 

 less transverse and laterally non-tuberculate prothorax, finer and 

 sparser punctures and shorter and more slender legs; it has the 

 same transverse white elytral fascia just before the middle. This 

 species cannot be the same as that called puncticollis by Bates, after 

 Dupont in the Salle collection, from Cape San Lucas and Mexico, 

 for the punctures are notably finer and feebler than usual. I have 

 a specimen labeled simply "Lower California," however, in which 

 the thoracic punctures, while sparser than in multifasciatus, are 

 stronger; this may possibly be the puncticollis of Bates; it is much 

 larger than lucanus and more elongate than multifasciatus, and 

 has joints eight to ten of the female antennae much shorter 

 than wide and with lateral thoracic protuberance, although the 



