160 DIPLOPODA. 
1. Orthomorpha gracilis. 
Fontaria gracilis, C. L. Koch, Syst. d. Myr. p. 142 (1847) *. 
Paradesmus gracilis, Latzel, Myr. Osterr.-Ung. Mon. ii. p. 162, t. 6. fig. 70 (1884) * 
Orthomorpha gracilis, Pocock, Ann. & Mag. Nat. Hist. (6) xv. p. 354 (1895) * ; and of subsequent 
authors. 
Colour dark chocolate-brown with yellow keels. 
Length from about 16-20 millim., width about 2. 
Hab. Evroprr, Asia, &c. 
This species, almost cosmopolitan in distribution owing to introduction by human 
agency, has been recorded by Brodlemann from Guatemala (Mém. Soc. Zool. France, 
xiii. p. 97, 1900) and Costa Rica, San José (Ann. Soc. Ent. France, lxxiv. p. 341, 
1905). 
Closely allied to the foregoing, and almost equally widely distributed, is Orthomorpha 
coarctata, Saussure. Originally from the Eastern Hemisphere, this species has been 
recorded from various localities in the Neotropical Region (Cayenne, Paraguay, Chile, 
Jamaica), and by Brélemann from Cocos Island, which is under the protectorate 
of Costa Rica (Ann. Soc. Ent. France, Ixxil. p. 139, 1903). Its size and coloration 
are the same as in O. gracilis; it differs, however, from that species in being rather 
more convex dorsally and in the shape of the phallopods. ‘The tibial element of the 
appendage in O. coarctata is long and slender, and the seminal stile is protected by a 
simple sheath-like auxiliary branch. In O. gracilis, on the contrary, the tibial element 
is short and conical and the seminal stile is protected by a much more complicated 
auxiliary branch provided with accessory processes. 
Fam, CHELODESMIDA. 
Chelodesmide, Cook, Ann. N. York Acad. Sci. ix. p. 4 (1895). 
Leptodesmine, Attems, Denk. Akad. Wien, Ixvii. p. 369 (1900) *. 
Keels of the 2nd segment well developed, but on the same level as those of the 3rd and Ist, the latter 
as wide as those of the second or nearly so; keels of the rest large or small, with more or less 
well-marked thickened pore-area. Antenne and legs elongate and slender. Caudal process subcylindrical 
or triangular, apically truncate. Phallopods simple or complicated. 
Distribution. Central and South America; Mediterranean Region. 
Subfam. CHELODESMIN. 
Leptodesmine (s. s.), Carl, Rev. Suisse Zool. xi. p. 544 (1903). 
Phallopods with coxal calear; generative processes of second leg in male short, blunt, and subconical, at least 
in Central-American genera. 
Distribution. As above for Chelodesmide. 
