NO. 1330. WALKIXGSTICKS OF THE UNITED STATES— CAUDELL. 869 



The supranaal plate of this species is shown at Plate LVII, fior, 8, and 

 for this drawing 1 am indebted to the descril)er. This species seems 

 remurlvable for the extreme brevity of the posterior femora. 



PSEUDOSERMYLE TRUNCATA, new species. 



Plate LVIII, figs. 3, 3a, ?,h. 



Color grayish brown. Head abo\e with two pairs of prominent 

 carina?, the carina? of each pair sul)parallel at l)ase, flaring somewhat 

 just beyond the middle and then rapidly converging slightly l)eyond 

 the eyes hj the incurving of the outer carina. Just anterior of the 

 termination of these carina^ is an elevated, postei'iorly bifurcated 

 tubercle and between the two pairs of carim\? is a minute mesial carina 

 extending halfway along the length of the head. Antennje basally 

 thicker than in sfngata. Pronotum above with a slight mesial longi- 

 tudinal incision and with a shallow transverse furrow just l)ehind the 

 middle which does not extend to the borders, which are strongly cari- 

 nate; disk with two subdorsal carinie, less distinct behind the transverse 

 furrow, and Avith a couple of indistinct, less elevated carina^ between 

 them and the border of the pronotum; mesonotum, and metanotum, 

 together with the intermediary segment and the abdoiuen carinated as 

 in siric/ata, but the whole body is nuich less covered with tul)ercles, 

 the abdomen being almost entirely destitute of them and the thorax 

 supplied more sparingly than in that species. Legs much luore robust 

 than in strigata and showing traces of fuscous bands more noticeable 

 on the middle femora. Supraanal plate broader than in strigata and 

 subtruncate apically . Cerci short and comparatively broad , about three 

 times as long as broad. 



Length of body, 73 mm.; mesothorax, 16.5 mm.; metathorax. 1(».5 

 mm.: middle femora, 15 mm.; hind femora, 20 mm. 

 One female, Dos Cabezos, Arizona. June. ISOl. 

 Ti/pe.—^o. 6613, U.S.N.M. 



One immattire female specimen, in poor condition, from Bright 

 Angel, Arizona, is referred to this species, it lias the posterior femora 

 extending onlv to the middle of the fourth abdominal segment and the 

 basal live segments of the alidomen are furnished posteriorly above 

 with two prominentlv elevated tubercles, one on each side. 

 I The U. S. National Museiun also contains one female and six male 

 f specimens from Los Angeles County, California, that evidently belong 

 here. The female is apparentlv immature, probably being in the last 

 stao-e. It is 51 nnu. long, and the posterior femora are 16 mm. m 

 lenoth. The males differ from the females in being entirely smootli 

 except for the two main carina on the anterior part of the head 

 between the eves, and in being smaller and quite slender. The cerci 

 project obliquelv downward, are tritid apically, the center branch 

 formino- the terminus of the main body of the cerci, and engage each 



