92 The Crasjiedosomatidse of North America. 



Males with 6 ambulatory legs in front of the genitalia and 39 behind. 



First two pairs of male legs with the last joint peetinately spined. 



Legs 3-6 of male distinctly crassate, the inner side of the last joint tomen- 

 tose piilvillate. 



Seventh legs of males three-jointed, the basal joint large, produced, the 

 others small clavate; an indistinct very small fourth joint (rudimentary claw?). 



Genitalia very complex, the anterior large, somewhat hood-like, with an 

 included lamella; the posterior pair slender, apically bifid. There is present 

 a clavate, distally hirsute structure much resembling the ninth legs of some of 

 the species of Craspedosoma, but Dr. Latzel does not so interpret it. 



The tenth male legs have also been completely modified for copulatory pur- 

 poses, consisting of slender processes. 



In females are but 49 ambulatory legs, and the sternum of the third seg- 

 ment j)rojects cephalad covering the genitalia. 



The above characters are from Latzel's description of Ghor- 

 deuma sylvestre, the t3q3e of the genus. The description and 

 figures of Yerhoeff * differ considerably from those of Latzel, in 

 the shape of the genitalia as well as in that of the seventh and 

 ninth legs. 



Chordeuma rlienanuin. Verhoeff. 

 Seventh legs reduced to a single scxuamiform joint. 

 Tenth legs also of one joint, irregular in shape, with rounded prominences. 



Cliordeuma germanicum Verhoeff. 



Differs greatly in the genitalia, but has the table-like ninth legs 

 of the other species as figured by Verhoeff. 



Chordeuma has, perhaps, nearer relatives in America than the 

 other Eui'opean genera, as already- noted under the genus Caseya. 

 The rudimentary seventh and tenth legs of the males of Chor- 

 deuma, as well as other secondary sexual characters, give distinct 

 lines of genei'ic separation. 



In addition to the European genera of Craspedosomatidse 

 already noted there have been described three others, Hyphan- 

 turgus of Waga, Megalosoma of Fedrizzi, and Prinosoma of Ber- 

 lese, but these have not been recognized by Latzel and Haase, 

 and stand as synonyms of Atractosoma and Craspedosoma. 



H£T£ROCHORD£UIN[A Pocock, 1893. 



Ann. Mus. Storia Nat. d. Genova XIII, p. 387. 

 Eyes of numerous ocelli (11) arranged in four transverse rows. 

 Antennae moderately long, third and fifth segments longest. 



*Berliner Eutom Zeitschr, xxxvi, p. 132 (1891). 



