ATITHEOPOD FAUITA OF THE WEST INDIES. 511 



Length of largest example ( c?) 16 mm., width 4'5; length of 

 $ described 13, width 3. 

 Locality. St. Vincent {H. H. Smith). 

 " Forest below 1500 ft., under rotting leaves ; pretty common." 



*PLATTB,HACHirs MACULATUS, Bollman, Pt. U. S. Nat. Mus. 1888, 

 p. 336. 



Locality. Cuba. 



Judging from the description of this species, its most remark- 

 able character is its minute size. Mr. Bollman does not state 

 that his two specimens are immature, yet the length of the $ is 

 only 12"8 mm., and of the 6 only 9 mm. The following species 

 that I have described is small for the genus, which contains the 

 giants of the family ; but it is very much larger than this Cuban 

 form of Bollman's. 



Plattrhachits luci^, sp. n. (PL XXXIX. figs. 3-3 d.) 

 Colour blackish brown above, the cylindrical part of the somites 

 ferruginous, with a median black spot ; legs, antenuse, and 

 margins of keels ochraceous. 



Kead finely granular. Antennce short, ^irst tergite about as 

 wide as the head, convex above, and covered with low close-set 

 granules, a distinct row of small tubercles along the anterior 

 border; the second tergite wider than the first and third, its 

 keels like those of the third and fourth, depressed and directed 

 forwards. The keels of the rest small and squared, situated 

 above the middle of the side, and horizontal, although the upper 

 surface follows the slope of the dorsum, the keels of the three 

 posterior somites are directed backwards ; the angles of the keels 

 are nearly right angles, the external border lightly convex, entire 

 or subgranular, the lateral portion of the keel marked off from 

 the rest by a longitudinal groove. The whole of the upper sur- 

 face of the posterior half of the somites somewhat coarsely 

 sculptured, lowly granular, and divided up into areas very much 

 as in Polydesmus, s. s., the centre of each area bearing a granule 

 which is slightly more prominent than the rest. The pores 

 situated in the posterior half of the keel just above the lateral 

 edge. The lateral part of the segments sparsely and finely 

 granular; the cylindrical very closely punctulate. The anal 

 tergite posteriorly convex. Sterna smooth or obsoletely granular, 

 but spined. Legs short, robust, and hairy. 



