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  New genera and species of cavernicclous diplopods from  
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}  Alabama :_
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  By Richard L. Hoffman Q
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  Department of Entomology, Cor11ell University _g
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zjl Among the diplopod material collected IH various Ala- {
Tgbama caves and sent to me for study by Dr. \Valter B. Jones, Q
=-§State Geologist of Alabama, are specimens representing new §
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gispecies and genera in the families Lysiopetalidae and Qambali- ;
ggdae. Both ot these groups have been treated in thorough re- g _
égvisions by H. F. Loomis, and it has been accordingly possible  
f§to work up the specimens with a minimum of effort and doubt.  
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  Order CHORDEUMIDA  
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  Family Lysiopetalidae  
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jj Tetracion, new genus  
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- Diagnosis.—A genus characterized by the presence of i
·;»nly four primary crests on the tergites, this number being  
constant from the fifth to the antepenultimate segment. Sec- 1
ondary crests eight, very much smaller than the primary se- {
ries, but fully as long, reaching the caudal margin of the ter- {
`gites; no tertiary crests present. Poriferous swellings very {
large, directed obliquely upward on the anterior segments and  
. becoming almost vertical on the posterior part of the animal.  
Collum with twelve short crests. Antennae long and slender.  
reaching back to the 7th segment. Ocelli reduced in size, 1
number, and pigmentation. Very large species, adult females ,5
usually more than 55 mm in total length.  
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._ Male gonopods suggesting those of Delophon; proxi- i
mally with short acicular sternal and prefemoral processes, a  
slender unmodified femur, and a broad laminate tibiotarsus.  
There is a distinct, distally free solenomerite subtended bas-  
ally by an unequally bifid parsolenomerite. Q
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  Type species.-Tetracion Jonesi, new species. i
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  Remarks.—This is the only lysiopetaloid genus known to  
me which has four primary crests on all of the segments. ln  
tall other genera the number is greater. and is not constant i
a1?h1‘Oughout the length ofthe body. Loomis (1937: 99) indi-  
gates that difference in the size of primary and secondary  
crests, well shown in Tetracion, is a specialized character.  
lglowever, the secondary crests in the present genus are not  
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