220 bulletin: museum of comparative zoology. 



165. Tridesmus portoricensis Silvestri. 

 Bull. Amer. mus. nat. hist., 1908, 24, p. 577, f. XII (1-3), XI (1-2). i 

 Habitat— T'ORTO Rico: Utuado (W. M. Wheeler) .^ 



166. loMus iNCisus Cook. 

 Proc. U. S. N. M., 1911, 40, p. 458, f. 4.i 

 Habitat. — Porto Rico: Mayaguez.^ 



167. loMus plat ANUS Cook. 

 Proc. U. S. N. M., 1911, 40, p. 459.i 



Habitat. — Porto Rico: Barrio Plata.^ 



168. loMUS OBLiQuus Cook. 



Proc. U. S. N. M., 1911, 40, p. 460.i ^ 



Habitat. — Porto Rico: near Bayamon.^ 



Pyrgodesmidae. 

 169. Treseolobus caraibianus, sp. nov. 



Type.— M. C. Z. 4,475. Paratypc.— M. C. Z. 4,476.^^ Haiti: 

 Manneville, December, 1912. W. M. Mann. 



Color brown, uniform. Head yellow, excepting the frontal region 

 which is brown. Venter yellow, as are the antennae and legs. Body 

 slender, with the dorsum exceptionally strongly arched, hemicylindri- 

 cal, the keels depressed. 



Tergites above with four longitudinal series of large tubercles form- 

 ing along the dorsum four conspicuous serrate ridges, the dorsum 

 elsewhere closely crowded with lower tubercles which are flatter and 

 less sharply marked on the keels. All tubercles covered with numer- 



