478 Mr. R. I. Pocock on the 



the task of identifying specimens from them is by no means 

 an easy one. However, short though they be, I have (with 

 one exception) found set forth in each case one or more cha- 

 racters which afford me sufficient grounds for concluding that 

 these specimens from Dominica belong to a species which is 

 now for the first time described. 



The following is a list of the species. After each I have 

 stated the character which leads me to consider the species to 

 be different from semirugosum. 



Str. concoloTj Gervais, Apt^res, iv. p. 117. — Chili. This 

 species is smooth, with subbifid anal tergite and squared 

 anal sternite. 



Str. spilonotum, id. ibid. — S. America. Cf. infra. 



Str. coccineiim, Saussure, Miss. Sci. Mex., Myriopodes, p. 50, 

 pi. i. fig. 12. — Orizaba. There is no transverse sulcus 

 on the hinder half of each tergite. 



Str. vermiforme, id. Mem. Mex. Myriop. p. -40, pi. i. fig. 4. — 

 Mexico. Tergites as in the preceding species. 



Str. vermt'cularej Peters, Monatsb. d. k. Akad. Berlin, 1864, 

 p. 536. — Caraccas. The anal sternite is feebly triden- 

 tate. 



Str. glabrum^ id. ibid. — Columbia. This species is smooth. 



Str. eruca. Wood, Journ. Acad. Nat. Sci. Phil. (1) ii. p. 106. 

 — This species is said to be punctate. 



Str. Poeyi, Bollman, Ent. Amer. iii. p. 82. — Havana. Ter- 

 gites punctate. 



Of the above species it is with spilonotum that semirugosum 

 presents the greatest affinities ; but Gervais's description, 

 although applicable so far as it goes to the latter, is not suffi- 

 ciently detailed to enable me to say with certainty that the 

 two are identical. 



Fam. lulidsB. 

 Spirostreptus {Nodopyge) dominicanus, sp. n. 



Species belonging to the Immucronate group of Brandt. 



Shining, piceous, posterior border of somites paler ; antennas 

 and legs testaceous. 



Head-plate. — Superior portion not marked in the middle 

 line by a longitudinal sulcus ; margin of the labrum furnished 



