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New Genus and Species of POLYDESMID^. 



By Charles H. Bollman. 



In examining the material of this family in the Museum of the 

 Indiana University and my own collection, I have found the following 

 new species. The types are deposited in the Museum of the Indiana 

 University. 



Genus I. POLYDESMUS, Latreille. 

 i. Polydesmus nitidus, sp. nov. 



Dark shining brown, beneath lighter, lateral plates reddish-brown ; antennae 

 dark. Moderately slender and depressed, acuminate anteriorly and posteriorly, but 

 not so much as in canadensis. Antennae exceeding the length of body, subclavate. 

 Fjrst dorsal plate wide, angles a little produced, sides one-toothed ; posterior border 

 with a row of fine, ciliated spines ; anterior row of scale barely distinguishable, middle 

 row of four, large scales, posterior of three, small ones in the middle and two larger 

 ones at both ends, anterior side scale small, other one (repugnatorial pore scale) large, 

 elongate. Other dorsal plates with the scales distinct, anterior angles rounded, 

 posterior produced, lateral margins 3 — 4 toothed, posterior border of anterior segments 

 ciliated ; anterior border divided by the median dorsal line into two large scales, 

 middle row consists of four scales, posterior of six, outer larger, anterior side scale 

 large and swollen, repugnatorial pore scale large and elongate ; scales of last 

 segments more elongate, marked with fine, irregular lines, the last row projecting 

 behind. 



Feet long, strongly crassate in the male and the femur swollen above, in the fe- 

 male somewhat crassate. q copulation foot large, slender and curved ; apex beneath 

 with several bunches of flat, spiny hairs, below this are four tubercles, the two lowest 

 ones on the inner side largest, elongate, the last one pointing towards the coxae, pili- 

 gerous pulvillus large, above which is a moderately long, topering branch and below 

 a tubercle. 



Length of body 15 — 18 mm.; width 2.8 — 3.5 mm. 



Hab. Pensacola, Florida. 



I have examined 15 specimens of this species, collected by myself in 

 the vicinity of swamps. This species is related to canadensis, but is 

 easily distinguished by the long, slender tubercles of the male genitalia. 



Genus II. CHiETASPIS, gen. nov. 



Body slender, not much depressed, more convex than in Polydesmus, but not so 

 much as in Scytonotus. 



Antennae with the third and sixth joints equal, the latter strongly swollen, second 

 and fifth subequal, fourth equal to seventh and eighth. Segments 20; lateral plates 

 distinct, but not as in Polydesmus, slightly angled, serrate ; dorsal plates smooth, ex 

 cepting a row of indistinct, sctigerous tubercles along the anterior and posterior 

 margins, no median, dorsal line ; last acuminate. Repugnatorial pore rather large, 

 placed on a moderately large and round tubercle, near the outer border of the 5, 7, 9, 

 10, 12, 13, 15, 16, 17, 18, 19 dorsal plates. 1 'airs of feet, rj 30, 9 3 1, 



