226 — 



anal scale obtusely rounded, pilose. Repugnatorial pore small, not touching the 

 transverse suture. Pairs of feet about 87, extending beyond the sides of body. 

 Male: Mandibulary stipes a little produced in the middle; genitalia concealed. 

 Length of body 18 mm., width ^ mm. 

 Habitat. Utah, California. 



I have e.\amined two adults and two young of this species collected 

 by Mr. James K. Burke after whom the species is named. 

 Genus II. PARAJULUS, Humbt. & Sauss. 

 To this genus belong our larger species of so-called yulus. From 

 the latter genus it is easily separated by the number of mandibulary 

 combs (10), the dwarfed second pair of feet and the form of the first seg- 

 ment of the male with its appendages. 



Under the genus Julus. Wood says "In all species in which I have 

 liad the opportunity of examining sexes, the form of the first scutum 

 ilistinguishes them with certainty. In the male its antero-posterior dia- 

 meter is large, and there are well marked lateral margins running nearly 

 at right angles to the others. In the female the anterior posterior dia- 

 meter is much less, but laterally the scutum is so produced that the an- 

 teiior and posterior margins may in most cases be said to meet one an- 

 other at ,111 , ingle. The males are further distinguished by a peculiar 

 alter uion ol the first pair of leet, which are transformed into a pair of 

 very large, thick organs.'' 



Bv applying this remark to those species of which he had both sexes, 

 we ha.c uiu.->i oi ilie species known to be in this genus at present, The 

 fnUowiiiL: !■> ,1 kt\ ii> tile subgenera. 



II. First se nnent enlarged in the male. First pair of feet of male large, cras- 

 s.ite, 1 uHRiou' short tuberci les on the inner side. Paraju.us. 



«« First segment alike in both sexes. First pair of feet of male short thick, 

 luberc e; absent. Pseudojulus. 



Sub-genus Parajuhts. 

 2. Parajulus castaneus, sp. nov. Color nearly the same as in P. tvujfj'esi'us, 

 (Say.) Moderately slender, rough, not pilose. Vertex finely wrinkled, a faint me- 

 dian sulcus, setigerous foveolie present. Antennne equalling the width of body. 

 Fyes distinct, triangular, ocelli 54 — 8. Segments 42 — 51. Sides of first segment 

 striated, others deeply striate beneath, above with numerous short lines, which are 

 l)ranched. 1 ast segment produced into a mo<lerate spine, projecting beyond tl)e 

 anal valves, not pilose; anal valves not marginate, j)ilose; anal scale obtusely round- 

 ed, small. Ivcpugiiatorial pore moderate, toucliing the transverse suture, which is 

 ^harply sinuate. Pairs of feet 66, equalling the width ol body. Male. Mandibu- 

 lary stipes strongly produced ; coxae of the second pair of feet as in impressus; 

 genitalia about half concealed, composed of three plates; anterior plate round, clavate, 

 p lose; midd'e plate curving up in front of anterior, and expanding between them 

 into an elongate plate, which has three lobes or spines on the inner side, the first large, 

 the second small and riglit behind ii, the last small, placed near the end; posterior 



