500 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.50. 



Achorutes. The skin is thickly covered with small conical chitinous 

 tubercules. Length, 0.75 mm. 



"Under boxes and plant jars in university greenhouse, where the 

 dirt is quite moist." 



Minneapolis, Minnesota, J. E. Guthrie (Univ. of Minn.). 



I have never seen this species, hence have simply copied Guthrie's 

 description and figures. Linnaniemi ('12, p. 58) says it is rather 

 likely that Gutlirie's species is his Friesea claviseta, described in 1900 

 (Axelson, '00, p. 112). 



Genus PSEUDACHORUTES Tullberg. 



Pseudachorutes Tullberg, 1871. 



Eyes eight on each side. Postantennal organs usually present, 

 with 6 to 20 peripheral tubercles. Antennae conical, four-segmented. 

 Mouth parts reduced, suctorial, projecting in a cone. Unguiculi 

 absent. Furcula present, not extending to the ventral tube. Anal 

 spines absent. Cuticula tuberculate. 



KEY TO SPECIES OP PSEUDACHORUTES. 



Dark blue or grayish blue throughout; postantennal organs oval. 



Mucrones elongate triangular; ungues untoothed; tenent hairs absent; post- 

 antennal organs with 20 to 25 peripheral tubercules complnxus, p. 501. 



Mucrones subcrescentic; ungues unidentate; one clavate tenent hair; i)ostantcnnal 



organs with 10 or 11 peripheral tubercles lunatus, p. 501. 



Pale purple; meso thorax andJast two body segments pale orange; postantennal organs 

 round aurcofasdatus, p. 500. 



PSEUDACHORUTES AUREOFASCIATUS Harvey. 



Plate ]9, figs. 169-173. 



Gnnthocephalus uureofasciatas Harvey, 1898. 



Pale purple above, excepting the mesothorax and the last two 

 abdominal segments, which are pale orange. Eyes (fig. 169) eight 

 on each side. Postantennal organ (fig. 169) with 12 to 15 peripheral 

 tubercles arranged in a rosette. Antennae subequal to head in 

 length (excluding the mouth parts), not approximate basally, with 

 segments as 10:9:10:12 in relative lengths; third and fourth segments 

 subconfluent. Buccal cone long (fig. 170). Ungues (fig. 171) stout, 

 strongly curving, with one or two teeth behind the middle of the 

 inner margin. Tenent hairs absent. Furcula short and stout. 

 Mucrones half as long as dentes, spoon-shaped (fig. 172). Cuticular 

 tubercles larger and more pointed on the last two abdominal seg- 

 ments than elsewhere. Long stout blunt curving hairs (fig. 173) 

 occur sparsely on the head, numerously on the last three abdominal 

 segments, and in a shigle transverse row on each of the first six body 

 segments. Length, 1.5 mm. 



