726 ritOCEEDINGS OF THE NATIONAL MUSEUM. 



This and the followinj? species were i)hice(l by Silvestri in the genus 

 Aulodesmns, but the distribution, size, and especially the structure of 

 the copulatory legs, seem to indicate much greater affinity with Sigo- 

 deamnH, the only genus which has three spines at the base of a two- 

 pronged tlagelluin, 



SIGODESMUS INNOTATUS (Silvestri). 



Aulodesmus innotatua Silvestri, Ann. Mus. Civ. Genoa, 1896, XXXVII, p. 59, 

 fig. 2. 



Color tliroughout testaceous and somewhat cinereous; antenna' and 

 legs coucolorous or reddish. Preanal scale witli the sides slightly 

 rounded and the apex truncate ; armed with three large tubercles, of 

 which the external bear each a long seta. 



Steinuni of segment 6 with a subrectangular upright process some- 

 what narrowed at apex and beset with seta?. 



Ninth pair of legs at base with a very small obtuse process. 



Sternum of segment 15, with a rather small, triangular, acute process. 



Copulatory legs with three long, slender processes surrounding the 

 base of the flagellum, which has at apex two prongs of subequal length, 

 of w hich the longer is more robust and less pointed. The more slender 

 process has a prominent acute angle at base, and below the terminal 

 prongs is a small rectangular process. 



Length, 28 mm.; width, ram. 



LocaliUj. — Magala lie Umberto, Somaliland. Specimens collected 

 by Prince lluspoli are in the Genoa Museum. 



The above description is translated and abridged from that of Sil- 

 vestri. 



It would seem, from a comparison of the figures, that the generic 

 affinities of this species are not with Aulodesmus, but that it is very 

 closely allied, i^ not identical, with S. contortus, which was published 

 in June, 1896, while InnotatuH api)eared in November of the same year. 

 The shape of the distal part of the flagellum is at least closely alike, 

 8. contortus being represented with the basal angle of the smaller 

 tooth more rounded and the subapical process more jiointed than in 8. 

 indigus. 



Genus ASTRODESMUS Cook. 



Astrodeamiis Cook, Proc. U. S. Nat. Mus., 1895, XVIII, p. 83. 



Body very large, about five times as long as broad, cavity scarcely 

 depressed; oblong, abruptly narrowed at both ends. 



Labrum scarcely emarginate, with three short, blunt teeth. 



Antennie filiform, joints in order of length 2, 4, 5, 3, 6, 1, 7. Seventh 

 joint broader than long, truncate, and with a conic depression in its 

 apical face; ten olfactory cones arranged in a circle around the edge of 

 the depression. 



Mandibulary stipe with exposed surface divided by sutures into five 

 areas, the basal larger than all the others together. 



