166 HETEROMERA. 
some scattered shallow coarser impressions, which are not nearly so coarse as in 
U. tricornis nor placed principally on the disc, but scattered irregularly over the sur- 
face. The surface beneath is punctured, the flanks of the thorax rugulosely. The two 
long horns upon the back of the head in the male are stout, subhorizontal, and slightly 
curved; in U. tricornis they are longer, thinner, and project upwards. 
Latreille described this species upon a single imperfect example, probably a poorly 
developed male. Labelled U. dicornis, Deyr., in the Sallé Collection. 
Trogosita vacca, Fabr., a species not identified by Lacordaire, is probably this or a 
closely allied species. 
In Mr. F. Bates’s collection there is a female example of this species labelled “United 
States, ex coll. Laferté ;” possibly, however, there is some mistake about this locality. 
6. Ulosonia marginata. 
Uloma marginata, Lec. Ann. Lyc. New York, v. p. 149°. 
Ulosonia marginata, Lec. Class. Col. N. A. p. 2337; Horn, Rev. Ten. of Am. north of Mexico, 
p- 867°; Lec. & Horn, Class. Col. N. A. p. 381. 
Hab. NortH America, Gila? and Colorado! rivers, Colorado desert ?. 
Found under cotton-wood bark just on our northern boundary. I have not seen this 
species. 
METULOSONIA. 
Metulosonia, F. Bates, Ent. Monthly Mag. ix. p. 261. 
Five species are now known of this genus, all from Tropical America, two inhabiting 
our country. 
1. Metulosonia horni. 
Metulosonia horni, F. Bates, Ent. Monthly Mag. ix. p. 262°. 
Hab. Panama! (coll. F. Bates). 
Closely allied to IZ. gyrinoides, Chevr., from Brazil. 
2. Metulosonia reflexa. (Tab. VII. fig. 20.) 
Peltoides reflexus, Chevr. Petites Nouv. Ent. no. 198, ii. p. 287 (1878) °. 
Hab. British Honpuras, Belize (Blancaneaux); Guatemaua, Yzabal (Sallé), Panta- 
leon, Zapote, El Tumbador, Torola, Las Mercedes (Champion); Nicaragua, Chontales 
(Janson). 
Not uncommon in Guatemala, beneath sappy bark. 
This species is again very closely allied to M/. horni, but the upper surface is more 
sparingly and finely punctured, the head smoother, the coarser scattered punctures at 
