no. 1842. THE HOTHOUSE MILLIPED AS A NEW GENUS— COOK. 627 



genera, and are therefore not to be reckoned as typical members of 

 the subgenus Paradesmus. The remaining division, containing the 

 genuine examples of Paradesmus, consisted of three species, Mugii 

 Brandt, erichsoni Brandt, and picteti Saussure. The first of these 

 should be considered as the true type of Paradesmus, and hence of 

 Orthomorpha as well. 



The propriety of this treatment is not affected by the fact that 

 Humbert and Saussure used the typical species of Paradesmus, ten 

 years later, as the basis of a new subgenus, Pachyurus. Bollman 

 found that this name also was preoccupied, and proposed to replace 

 it by Polylepis. In reality Orthomorpha was a sufficient substitute 

 for both Paradesmus and Pachyurus, since both these names were 

 proposed originally for the same species. 



APPLICATION OF THE NAME ORTHOMORPHA. 



In view of the preceding facts, it appears that the name Ortho- 

 morpha is applicable to a Central American genus of millipeds, with 

 0. Mugii (Brandt) as the typical species, replacing Amplinus Attems, 

 at least for the Central American species. Attems proposed this 

 name for a subgenus of Pachyurus, with a Peruvian species, P. 

 kalonotus, as the type. Pocock has adopted Amplinus as the generic 

 name of the Central American group to which Orthomorpha Mugii 

 belongs. 



ORTHOMORPHA POCOCKI, new species. 



Amplinus hlugi Pocock, Biol. Centr.-Amer., Diploda, p. 152, pi. 2, figs. 5c-5e, 1910. 

 Not Polydesmus hlugii Brandt, Recueil Mem. Myriop., p. 133, 1841. 



The species described and illustrated as Amplinus Mugi in the 

 Biologia is not to be considered as the type of the genus Orthomorpha. 

 The figures of the gonopods evidently do not represent the same 

 species as Brandt's type of Mugii in the Berlin Museum. The draw- 

 ings show that the gonopods are relatively short and robust, with the 

 two terminal prongs also rather short, nearly equal, and strongly 

 incurved or connivent. In the true Orthomorpha Mugii the gonopods 

 are much longer and more tapering, with longer, more unequal, and 

 only slightly curved prongs. Tracings of the gonopods of the type 

 specimen of Mugii at Berlin are much more similar to Pocock's 

 figures representing Orthomorpha areata and 0. jlavicornis than to 

 those of 0. pococki. The drawings of this species in the Biologia 

 represent a specimen from Jalapa, Mexico, in the British Museum, 

 which may be considered as the type of the new species. 



The type-specimen of 0. Mugii is supposed to have been collected 

 by Deppe at Alvarado, in the State of Vera Cruz. Four other species 

 of Orthomorpha are known from Mexico, 0. palicaudatus (Attems), 0. 

 erichsonii (Brandt), 0. armatus (Pocock), and 0. triramus (Pocock). 

 Three species are credited to Guatemala, 0. nitidus (Broelemann), 



