OF WASHINGTON. 27 



~ocelli are wanting, mandibles tridentate ; maxillary palpi of three 

 segments, galea andlacinia present but grown together and highly 

 specialized, forming an organ for piercing the plant tissue ; labial 

 palpi of one segment ; prolegs wanting ; anus situated on the ante 

 rior margin of the eighth abdominal tergite ; the spiracles of the 

 eighth abdominal segment large, situated dorsally, and their bases 

 developed into horns as already noted ; tubercles wanting ; setae 

 occurring in large areas between the folds of the skin. 



Of the Sagrini, I have had no larva?. 



Of the Criocerini, I have had but three species of two genera, 

 which genera seem to be poorly defined if judged by the larvae. 

 These species seem to be more nearly allied to the Chrysomelini, 

 quite distinctly so, though a larger series might show a relation 

 ship to the Donaciini. They are cylindrical larva?, tapering 

 slightly from the middle toward either end ; mandibles three to 

 five dentate ; ocelli six ; maxillary palpi of three segments, lacinia 

 wanting; labial palpi of one segment ; anal prolegs present; ven 

 tral abdominal tubercular areas protruding ventrad and function 

 ing as prolegs ; anus in Lema trilineata and Crioceris merdi- 

 gera on the anterior part of the ninth abdominal tergite, though 

 normal in C. asparagi. These two species cover the body with 

 excrement. They feed upon foliage. 



In the Chrysomelini the larva? of the genera Chrysomela and 

 Leptinotarsa have the abdomens strongly convex, while the re 

 maining genera are more or less flattened and resemble the Galle- 

 rucini in their shape. Ocelli six ; mandibles five-dentate ; max 

 illary palpi of three segments, lacinia wanting ; labial palpi of 

 two segments ; anal prolegs present ; a large part of the larva? 

 having glandular tubercles. 



The larva? of the Eumolpini are nearly allied to those of the 

 last tribe, are subterranean, feeding on the roots of plants, are 

 short, thick, cylindrical, arcuate; ocelli wanting ; mandibles tri 

 dentate or entire ; maxillary palpi of three segments, lacinia want 

 ing ; labial palpi of one segment ; anal prolegs present ; tubercles 

 sometimes faintly outlined, seta? strongly developed. 



Different larva? of the Gallerucini feed upon the foliage and 

 bore into the roots and stems of plants. The most typical shape is 

 that of the imported elm-leaf beetle, though the subterranean and 

 boring larva?, such as Diabrotica, become very elongate and cylin 

 drical instead of flattened. The Gallerucini seem to be the most 

 generalized larva?. In a few genera six ocelli are present, in most 

 they are reduced to a single ocellus, while often the ocelli are 

 wanting ; mandibles five-dentate ; maxillary palpi of three seg 

 ments, both galea and lacinia present ; labial palpi of two seg 

 ments ; the usual pair of anal prolegs forming a single proleg ; 

 tubercles well developed, generalized, rarely glandular, some 

 times with a metallic lustre ; tarsi with a well-developed pul- 

 villus. 



