14 PROCEEDINGS OF THE NATIONAL MUSEUM. vor.. CI. 



as do also the forms described as Trigoniulus frater^ remofus, and 

 gaiiiumi. This leaves T. lumbricinus (Gerstaecker) as the only 

 species of Trigoniulus sens. str. known to occur in the West Indies. 



Suborder POLYDESMOIDEA. 



Family STRONGYLOSOMIDAE. 



Genus ORTHOMORPHA BoUman. 



ORTHOMORPHA COARCTATA (Saussure), 



Polydesimis coarctaia Saussvre, Mem. Soc. Phys. Geneve, ISGO, p. 39, fiir. 18. 



Localities. — Cuba: Isla de Pinos, Bibijagua (June, 1918, T. Bar- 

 bour and W. S, Brooks) ; Habana (August 5, 1900, Palmer and 

 Riley) ; Baracoa (January 30, 1902, Wm. Palmer) ; Cabaiias (June 

 4, 1900, Palmer and Riley) ; Yateras, Bella Vista, Oriente Prov. 

 (May 4, 1907, W. R. Maxon) ; El Guama (Palmer and Riley, March 

 6, 1900). 



Porto Rico: San Juan (November 5,1899) ; Vieques (L. Stejnegor, 

 March 28, 1900). 



Family LEPTODESMIDAE. 



Genus AMPHELICTOGON Chamberlin. 



AMPHELICTOGON DOLIUS. new species. 



The middorsal region dark brown, the keels and a varying area 

 of the contiguous part of dorsum dull yellowish white, the light 

 area on each side commonly broader than the median brown area, 

 the latter sometimes greatly reduced on posterior segment. Keels 

 under lens showing dense area of small darker spots. The collum 

 yellowish over keels and along caudal border and in a small lunate 

 spot at anterior border, or this spot sometimes absent. Prozonites 

 dark brown above, uniformly paler or testaceous below. Anal 

 valves dark brown or blackish, uniform, contrasting with the pale 

 anal scale. The last tergite dark only across base. 



Second, third, and fourth keels each with a distinct tooth at the 

 antero-lateral corner. Caudal margin of keels somewhat convex 

 and wholly Avithout teeth. Processes of nineteenth tergite small, 

 rounded ; those of eighteenth tergite about equalling those of seven- 

 teenth but a little more rounded. Processes of other tergites weak. 



Length. — 32 mm., ; width, 4.5 mm. 



Locality.— Cuh'A : Punta de Judas, 40 miles east of Caibarien (T. 

 Barbour, 1917-18.) 



Type.— C^it. No. 5024, M. C. Z. ; paratypes Cat, No. 5025, M. C. Z. 



