﻿EURYURID MILLIPEDS — HOFFMAN 237 



TENTATIVE KEY TO THE AMERICAN GENERA OF EURYURIDAE 



1. Anal sternite distally truncate, with two large setiferous tubercules. 



Amplinus 

 Anal sternite semicircular, with very small tubercules or none 2 



2. Male gouopod without solenomerite ; tibiotarsus, if present, not set off from 



femur 3 



Male gonopod with a definite solenomerite branch 4 



3. Gonopod without perceptible (ibiotarsus Auturus 



Gonopod with a long slender tibiotarsal portion Euryurus 



4. Gonopod with two tibiotarsal branches Polylepiscus 



Gonopod with a single tibiotarsal process 5 



5. Tibiotarsal portion of gonopod broad, short, laminate, solenomerite very 



short 6 



Tibiotarsus long, slender, usually terete in cross-section, solenomerite 

 typically long 7 



6. Tergites with tliree transverse rows of large tubercules Protaphelidesmus 



Tergites completely smooth Ptyxogon 



7. A large ovoid swelling below each antenna 8 



No swellings under the antennae Pycnotropis 



8. Distal end of tibiotarsus of gonopod pointed, or at least unbranched. 



Phinotropis 

 Distal end of tibiotarsus variously modified 9 



9. Tibiotarsus straight or simply curved, parallel sided, distally bifid. 



Thrinoxethus 



Tibiotarsus long and slender, bent into a sigmoid curve, with the terminal 



end trifld Sigrmogonotropis 



Family EURYURIDAE Pocock 



Euryurinae Pocock, Biologia Centrali- Americana, Diplopoda, p. 147, 1909. 

 Genus AMPLINUS Attems 



Pachyurus (Amplinus) Attems, Denkschr. Akad. Wiss. Wien, vol. 68, p. 281, 

 1899. (Genotype: Polydesmus klugi Brandt.) 



Range. — Mexico (Veracruz and Hidalgo) south to Costa Rica, 

 Species. — Amplinus abtrusus (Karsch), areatus Pocock, armatus 

 Pocock, crenus Chamberlin, convexus (Carl), erichsoni (Brandt), 

 flavicornis Pocock, Mugi (Brandt), manni Chamberlin, niteus Cham- 

 berlin, nitidus (Brolemann), orphinus Chamberlin, palicaudatus 

 (Attems) , tapachidue Chamberlin, triranms Pocock, vergelanus Cham- 

 berlin, and xeliilus Chamberlin. 



AMPLINUS FLAVICORNIS Pocock 



Amplinus fiavicornis Pocock, Biologia Centrali- Americana, Diplopoda, p. 151, 

 pi. 11, fig. 2, 1909. 



Chiapas : Palenque Ruins, near Palenque, July 8, 1949, C. J. Good- 

 night collector. 



This is the first definite locality for the species, which was described 

 from "Central America." The specimens at hand match the original 



