196 BULLETIN 46, UNITED STATES NATIONAL MUSEUM. 



spirally twisted, end expanded, very thin and sinuate; near the point 

 where the foot is decurved there is on its anterior surface a sharp, 

 stout, triangular, downward pointing; spine; from the posterior side of 

 foot may be seen a small hooked spine springing from the inner side of 

 fan-shaped end. 



The collection contains two specimens which are so broken that I 

 was unable to obtain good measurements. 



10. Orthomorpha coarctata (Saussure). 



(Orthomorpha, nom. gen. nov. for Paradesmus Saussure, which is preoccupied by. 

 Paradesmus Corda, Polyg.) 



I860. — Polydesmus coarctatus Saussure. Myr. Mex., 39 (Cayenne). 



Ig81. — Polydesmus (Paradesmus) vicarius Karsch. Troschel's Archiv f. Naturgesch., 38 



(Mayotti, Aujoani, Africa). 

 1887. — Strongylosomapoeyi Bollman. Ent. Amer., 82 (Cuoa). 



Two specimens (male and female) were found in a vial containing Spi- 

 rooolus surinamensis, which were identical with a specimen in another 

 vial from Paramaribo, Surinam. As these specimens are from the same 

 region where the types of coarctatus were from, I have not hesitated to 

 identify them with that species; in fact, if I had no males the locality 

 would be the principal means of identifying, as it is impossible to sepa- 

 rate gracilis, coarctatus, and dasys by any other point than that of the 

 male genitalia. My identifying these specimens with coarctatus and con- 

 sidering vicarius and_poeyi identical, as shown by the copulation foot of 

 the males, has led me to study the different species belonging to this 

 group. Herebefore coarctatus has been considered identical with Fon- 

 taria gracilis Koch, from Pulolos, Austria; but as proven by Latzel's 

 figure* of the copulation foot of Austrian specimens, this can not be. 

 Coarctatus and gracilis have also been considered identical with a 

 certain species from Borneo, Timor, Alinda and Viti-Levu, and a few 

 other East Indian localities; but even these specimens as shown by 

 Karsch's figure t of the male copulation foot, although more allied to 

 gracilis than coarctatus, are not identical and represent an undescribed 

 species (0. Karschi, sp. nov.). On account of these changes and dif- 

 ferences the species of Orthomorpha should stand as follows: 



1. Orthomorpha coarctata (Saussure) (=vicariust—poeyi). Habitat: West In- 



dies, Surinam, Brazil, and Africa. 



2. Orthomorpha beaumonti (Le Guillon) (=P.spectabilis Karsch). Habitat: 



Borneo and Java. 



3. Orthomorpha pekinensis (Karsch). Habitat: Peking, China. 



4. Orthomorpha flavolimbata (Guldensteeden and Egelhig). Habitat: Japan. 



* Die Myr. Ost.-Ungar. Monarch., Taf. vi, fig. 70. 



t Troschel's Archiv f. Naturgesch., Taf. in, fig. 7, 1881. 



\P. vicarius Karsch may not be identical with coarctatus, as his figure of the male 

 genitalia only shows two points, while in coarctatus there are three; but as they are 

 small, it is very probable he did not observe the third. 



