58 The Craspedosomatidse of North America. 



this is not necessarih' the implication of Dr. Packard's statement, 

 What is intended by the front being carried up on the vertex, we 

 cannot imagine. In the species known to ns it is practically im- 

 possible to make out an}' definite lines of division between these 

 parts of the head. " Female," is twice used where " male" was 

 evidently intended. Dr. Packard was of coui'se aware that in 

 chilognaths the eighth legs of females are unmodified. 52 legs 

 would be a most unusual number, for allowing one pair of legs each 

 for the 1st, 2d, 4th and 28th segments, and nor e for the 3d, 29th 

 and 30th, there can be but 50 legs on a female chordeumid, 48 or 

 4 9 on a male. 



Dr. Packard's figure (see pi. I., fig. 13) of the ninth pair of 

 legs and the genitalia gives us no idea of the method of attach- 

 ment of the former, and the length of the second joint does not 

 correspond to that given in the description. A laciniate pro- 

 cess is probably present as in Zygonopus and Trichopetalum. 

 but in other respects there is a wide diflference from those tjqoes, 

 and a further study of the species will probably prove very 

 interesting. 



Reasoning from analogy and from the statements of the writers 

 quoted, we suppose that this species has undergone the same de- 

 terioration of the exoskeleton as is described for Zygonopus 

 whitei. 



Regarding the distribution of this species. Dr. Packard adds : 



"The specimens were most abundant in the Labyrinth in Mammoth Cave, 

 but also occurred in other localities in the cave. It is also common in Dia- 

 mond Cave, where I collected it, and was discovered by Mr. Sanborn in Poyn- 

 ter's Cave, 300 yards from daylight. In one of the sjiecimens from the last- 

 mentioned cave, the antenna; are rather more slender than usual. 



" The genus Scoterpes, and its single species copei, appears to be limited to 

 Mammoth Ca\e. and the others near, in apparently' the same system of caves. 

 It was erroneously reported by me to occur in Weyer's and the Luray Caves, 

 as the specimens collected belong to Zygonopus whitei. Without doubt the 

 genus is a modified Trichopetalum, which has become longer and slenderer in 

 body, with longer legs and antennae as well as setae ; whether it is a descend- 

 ant of Trichopefahim limatum or not is uncertain ; it may have descended from 

 a different species ; hut there seems to be no reasonable doubt that it is a modi- 

 fied form of a small hairy Ij'siopetalid form, with antennae exactly like those 

 of Trichopetalum." 



Dr. Packard's sections led him to the conclusion that the 

 present species is as truly eyeless as a Polydesmus. All traces 



