316 PHYTOPHAGA. 



26. Disonycha crenicollis. (Tab. XVIII. fig. 22.) 



Disonycha crenicollis, Say, Bost. Journ. 1835, i. p. 200 \ 



Hob. Mexico \ North Sonora (Morrison), Puebla (coll. Salti). 



The description given by Say applies accurately to the specimens obtained at the 

 above locality, and which I must refer therefore to the present species ; the antennae 

 have the fourth joint distinctly longer than the third and are black, with the exception 

 of the first or following two basal joints, which are more or less fulvous ; the thorax is 

 generally five-spotted and of a narrow transverse shape ; of the spots, the two middle 

 ones are always small and black, the lateral ones large and piceous or fulvous; the 

 outer edge of the elytra as well as their epipleurse are testaceous, and the longitudinal 

 band at the disk of the elytra is narrower as a rule than the yellow portion ; the under- 

 side has the lower part of the metasternum and its sides, as well as the apical margins 

 of the abdominal segments, and the tibiae and tarsi black and closely pubescent ; apex of 

 the posterior and the upper edge of the anterior femora black. The punctuation of 

 the elytra is extremely fine. 



To distinguish this species from the many closely allied forms, the five-spotted thorax 

 and the colour of the underside will be found the most important characters ; without, 

 however, having the type to compare, all doubts as to the proper identification either of 

 this or the other similarly coloured species cannot be set at rest. 



27. Disonycha capitata. 



Below flavous ; femora fulvous ; base of the head, antennae, and tarsi black ; head rugose-punctate ; thorax 

 with two black spots; elytra testaceous, with a narrow sutural, discoidal, and lateral black stripe, 

 impunctate. 



Length 3-3| lines. 



Hab. Mexico, North Sonora (Morrison), Tuxtla, Cosamaloapam (coll. Salle)-, 

 Guatemala, Zapote, Panzos (Champion). 



The differences to be found in this species by which it may be separated from similarly 

 coloured ones are as follows :— the head between the eyes is closely rugose-punctate 

 (in which this species differs from any other known to me), the frontal tubercles are 

 more distinctly raised than is generally the case ; the sides of the thorax on the disk 

 are more or less distinctly raised in the shape of tubercles, these latter being frequently of 

 an obscure piceous colour ; the longitudinal black bands of the elytra are very narrow, 

 the intermediate one is sinuate or slightly curved inwards at the middle, while the 

 band near the lateral margin is often very indistinctly marked ; the legs are without 

 black markings, only the extreme apex of the tibiae and the tarsi are of that colour ; 

 the antennae are proportionately long and slender, and the fourth joint is longer than 

 the third ; the elytral epi pleurae are entirely flavous. 



It is possible that this species is identical with one of those described by Leconte ; 

 but as this author makes no mention of the rugosely punctured head, and as, moreover, 



