54 PROCEEDINGS OP THE NATIONAL MUSEUM vol. 82 



collis does not fit any species of Dkomjcha known to me either from 

 North America or Central America. It differs from collata in that 

 the head is " blue black " with " immaculate face," and the venter is 

 blackish with the last segment dull yellow. It differs from triangu- 

 laris, xaiithomelas, and politula in that the " thighs are honey- 

 yellow." 



Disonycha collata is somewhat variable in both size and punctation. 

 The Florida and Kansas specimens are usually much smaller and 

 green, and with very fine punctation, while the Texas and northern 

 specimens are larger, bluish in color, and with distinct punctation. 

 There is no difference in the aedeagi, however. The species ranges 

 from Portland, Maine, west to Kansas and Missouri, and south into 

 Mexico and Central America. 



25. DISONYCHA SEMICARBONATA LeConte 



Plate 6, Figure 33 



Disonycha semicarJ)onata LeContb, Smithsonian Contr. Knowl., vol. 11, p. 25, 

 1859 (Santa Fe, N.Mex. ; type in LeConte collection, Mus. Comp. Zool.). 



Disonycha mellicollis Horn, Trans. Amer. Ent. Soc, vol. 16, p. 210, 1889 (in 

 part). 



Description. — Oblong oval, feebly shining, black; front, prothorax, 

 last ventral segment, and femora pale. Head with interocular space 

 slightly more than half width of head; frontal carina narrowly 

 produced; punctation coarse and rather dense over occiput and 

 down front to tubercles ; head dark except for frontal tubercles and 

 about base of antennae and upper portion of carina. Antennae dark 

 with paler basal joints, third, fourth, and fifth joints subequal, the 

 fourth slightly the longest. Prothorax about twice as wide as long, 

 almost rectangular with sides nearly straight, somewhat convex; 

 alutaceous and finely, rather densely punctate, entirely pale. 

 Scutellum dark. Elytra oblong oval, convex, with humeri not 

 marked and with little trace of intrahumeral sulcus; distinctly 

 alutaceous, closely and moderately coarsely punctate; entirely 

 black and not very shining. Body beneath finely pubescent, dark, 

 the prosternum, last ventral segment, and femora pale. Length, 5 

 mm ; width, 2.8 mm. 



Type locality. — Santa Fe, N.Mex.; one specimen (female) col- 

 lected by Fendler. 



Distribution. — New Mexico (Santa Fe, Magdalena Mountains) ; 

 Colorado (Boulder). 



Food plant. — Unknown. 



Remarks. — Although this species has been synonymized with 

 mellicollis (see discussion under collata on p. 53) by Horn, it is 

 quite different, having a bicolored head and distinctly punctate 

 pronotum. It differs from collata in that while the femora are pale 



