206 [December 



of Arliopalus — the in/austus of LeConte, as kindly determined for me 

 by that author himself — the % and $ of which are as much alike as 

 those of rohhiise, and scarcely diflfer from my specimens of that spe- 

 cies % 9 ) except in the yellow bands being nearly twice as wide and 

 the antepenultimate one at the tip of the elytra nearly thrice as wide, 

 and in the legs being brown-black instead of ferruginous. With the 

 exception, however, of the antepenultimate one, the yellow bands of 

 this species are no wider than in Harris's figure of rohinise. (InJ. Ins. 

 PI. II. 10.) Besides the above colorational characters, there is a very 

 slight, but constant, structural character which distinguishes in/austus 

 both fvom pictus and from rohinise. In the former % $ the antennal 

 joints 2 and 3 are together j — J shorter than joint 1; in the two latter 

 species % 9 they are equal to joint 1 . Of in/anstus my friend Dr. Velie 

 took in the middle of September, 1864, eight % four 9 on the Platte 

 River in Colorado, near Baker's Ranch; and as both he and Dr. Parry, 

 the Iowa botanist, agree that there were no trees but cottonwoods grow- 

 ing within a great many miles of that locality, the presumption is that 

 that insect inhabits the cottonwood. In that case we have here a third 

 (Phytophagic) Species belonging to this group, which agrees with ro- 

 hinise in all the six % characters that separate that species irovn p ictus, 

 {Proc. &c. III. p. 421,) and also in the time of the appearance of the 

 imago; but differs S 9 ^^ specified above i\-om j) ictus % 9 ^^^^ rohinise, 

 % 9 ! '^ii'i ^Iso in its food-plant. 



Callidium antennatum Newman (=violaceum Eur?) and C. lAN- 



THixuM Lec. (Coleoptera.) 



The former of these two very closely allied species lives in pine wood, 

 according to Harris, and comes out from the middle of May to the first 

 of June. {^InJ. Ins. p. 100.) Of the latter, as determined by Dr. Le- 

 Conte himself. Dr. Velie took ten specimens in Nebraska in the month 

 of May in and on Red Cedar, which tree they were infesting in enor- 

 mous numbers. Hence the two may be considered as Phytophagic 

 Species. lanthinum differs as follows from antennatum on comparison 

 with 2 S 1 9 t>f the latter received by me from the Eastern States : — 



\st. The length (ten specimens) is .39 — .45 inch instead of .55 — .60 

 inch, or, according to Harris, .40 — .00 inch. 



2/1(7. The thorax is only one-third shorter than wide instead of one- 

 half shorter. 



3/-(/. The widest part of the thorax is a little hehind the middle in- 

 stead of a little be/ore the middle. 



