18G5.] 207 



4^^. The sculpture above is, not only relatively, but absolutely 

 coarser, especially on the thorax. 



5^/;. On the pronotum % there is no subpolished dorsal shield, bounded 

 Literally by a distinct unidentate stria. Dr. LeConte informs me that 

 this character is always met with in % anfenuntum, and it is very con- 

 spicuous in both my % % . I have been unable to ascertain, what are 

 the characters which are supposed to separate out antenna htm from the 

 European violaceum, which also feeds on pine, and with which it was 

 formerly confounded. The name seems to indicate that there is sup- 

 posed to be some diiFerence in the size or structure of the antennae. 



CoNOTRACHELUS NENUPHAR Hbst. (Coleoptera.) 

 It has long been known that a race of this insect inhabits the But- 

 ternut and Walnut, which is full one-half longer and wider than the 

 race which infests the Plum. I have met with numerous specimens of 

 both, but never found any intermediate size. Say states, on the au- 

 thority of Bartram, that this insect also " destroys the European Wal- 

 nut iu this country," but does not notice any difference in the size of 

 the Walnut-inhabiting race. I conceive that the two are Phytophagic 

 Varieties or perhaps Species, differing from each other as do the two 

 races of Chrysomela scalaris Lee, which inhabit respectively the bass- 

 wood and elm or the dogwood and plum. (Proc. &c. III. p. 403.) 



DoRYPHORA 10-LiNEATA Say and D.juncta Germ. (Coleoptera.) 

 I have already, in the "Practical Entomologist" (No. 1), shown that 

 the former of these two very closely allied species inhabits plants be- 

 longing to the botanical family Solanacefe, and especially the genus 

 Solanum ; while the latter most probably inhabits the Hickory, or at 

 all events does not feed on Solanum. We may therefore consider the 

 two as Phytophagic species. 



Typically there are on the thorax of each of these species eighteen 

 spots, arranged in the same very peculiar pattern, viz: two large, diver- 

 gent, elongate ones arranged side by side in the middle, and respec- 

 tively between and behind these a single minute one placed on the 

 dorsal line ; while on each side of this four-spotted pattern are seven 

 small spots, five of them on the hinder part of the thorax in a quincunx 

 narrowed iu front, and the other two before this quincunx, scarcely 

 wider apart than the two hind spots of the quincunx, and obliquely ar- 

 ranged, so that the outer one of the two is always twice as far from the 

 anterior edge of the thorax as is the inner one. Now eighteen spots 

 may be arranged in a given trapezium in an almost infinite variety 



