498 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.50. 



spines (figs. 158, 159) on separated papillae, the spines not longer 

 than the papillae themselves. Claws short, unarmed, tibiae with two 

 clavate hairs. Ocelli (fig. 160) placed as usual in this genus. Anten- 

 nae hardly longer than the head. The second, third, and fourth seg- 

 ments about equal and somewhat longer than the first. The third 

 and fourth are broad. The mucro (fig. 161) is of a difi'erent form from 

 any described or figured so far, the recurved hook at its end being 

 quite characteristic of the species. The dentes and mucrones together 

 are about one-third longer than the claw. Length, 0.9 mm. Taken 

 rather rarely in damp places under boards along the Mississippi bot- 

 tom lands, where they live socially." 



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



This description and the accompanying figures have been copied 

 from Guthrie, as I have not seen specimens of the species. 



XENYLLA MARITIMA TuUberg. 

 Plate 19, figs. 162-166. 

 XenyllarmntimaTvLhB-ETiG, 1869, 1871, 1872.— Lubbock, 1873.— Brook, 1883.— 

 MacGillivray, 1891.— Schott, 18916, 1894a.— Uzel, 1891.— Schaffer, 

 1896. — PoppE and Schaffer, 1897. — Lie-Pettebsen, 1898. — Scherbakov, 

 1898.— Carl, 1899.— Wahlgren, 18996.— Borner, 1901f/.— Krausbauer, 

 1901. — Agren, 1903. — Carpenter and Evans, 1904.— Axelson, 1905, 

 1906.— (Axelson) Linnaniemi, 1907, 1912.— Caroli, 1914. 



Grayish blue. Eyes five on each side. Antennae slightly shorter 

 than the head. Fourth antennal segment with four olfactory hairs: 

 three lateral and one dorsal. Unguis (fig. 162) stout, without teeth 

 or with a single small tooth. Tenent hairs two, knobbed. Rami of 

 tenaculum tridcntate. Manubrium with a deep median-longitudinal 

 ventral furrow. Dens and mucro confluent (fig. 163); dental region 

 with two setae; mucronal portion with a blunt apical hook, an ante- 

 apical notch, and a narrow lamella. Anal spines two (figs. 164, 

 165), small, stout, curving slightly forward, on broad contiguous 

 papHlae. Clothing (fig. 166) of sparse curving setae, some of which 

 are denticulate. Length, 1.5 mm. 



Xenylla maritima, which occurs in most parts of Europe and in 

 northern Africa, has been recorded from California by Schott ('91, 

 p. 24). I have seen no American examples of this species, but have 

 studied 14 European specimens which I received from Dr. Caesar 

 Schaffer. 



California. — About 30 specimens, Dr. Gustav Eisen (Zool. Mus. 

 Upsala) . 



Tribe PSEUDACHORITTINI Borner. 



Pseudachorutini Borner, 1906. 



KEY TO GENERA OF PSEUDACHORUTINI. 



1. Furcula present 2. 



Furcula absent; unguiculus absent 5. 



2. Anal spines absent 3. 



Anal spines present 4. 



