NO. 1170. TEE FAMILY GOMPHODESMID^—COOK. 687 



of the preceding; the cariiuc broad and rounded, not exceeding those 

 of segment 18. 



Last segment rather narrowly triangular, abruptly narrowed near 

 the small, truncate apex. 



Anal valves with very thin and narrow, compressed margins, especi- 

 ally below; the margins are, however, not prominent and are greatly 

 exceeded by the projection of the last segment; surface of valves and 

 preanal scale subrugulose. 



Sterna rather densely hirsute between the bases of the legs, with a 

 naked dei)ression in the middle, between the anterior pair. 



Sternum of segment 5 with somewhat longer hairs at the base of the 

 processes, the apices of which are naked. 



Sternum of segment less hirsute, the processes with long hairs near 

 the apex. 



Ooxic of second legs of male slightly prominent ventrad. 



Legs of male moderately hirsute, the second joints only slightly 

 inflated on the superior face; joints 3 and 4 distinctly more crassate 

 than the others; joints 5 and finely tuberculate on the ventral face. 



Copulatory legs (Plate LV, tigs, la, 1^). 



Color of alcoholic specimens rather bright brown, the carina' yel- 

 lowish. 



Length, 17.5 mm.; width, 4.5 mm.; without carinic, 2.5 mm.; length 

 of antenn.e, 4 mm.; leg from tenth segment, 4 mm. 



Locality. — Itaviroudo, German East Africa. 



Three mature male specimens collected by Neumann in April, 1894, 

 are in the Berlin Museum. 



SubfaiTiily G!-0M:I>II0IDE!S]VIIN"^. 



The members of this group vary as much in size as any of the diplo- 

 I)od families, and inciude the most conspicuous of East African Mero- 

 cheta. The peculiar copulatory legs distinguish them not alone among 

 (ifrican forms, but separate thera at once from all others. 



ANALYTICAL KEY TO TIIK (iENKRA OK CiOMPHOOESMIN^E. 

 Series I. OOMl'UODESMI . Ol/aclory Cones 4. 



Process of sternum of sixtli segineiit of male very broad, divided nearly to tlie base 

 into two broadly rounded, thin, and lamellar lobes; copulatory legs with basal part 

 of secoTid joint long an<l slender, narrower than the unusually broad llagellum; the 

 conspicuous iiodiform process of the .sinus of the copulatory legs of other genera 

 appears here as a rather slender, llaf tened lateral tooth : Genus Ulodesmus, p. 689. 



Process of sternum of sixth segment subijuadrate or narrower, not extending to 

 the bases of the legs between which it is located; copulatory legs with llagellum 

 decidedly narrower than the basal jtortion, and with the i)roces8 of the sinus con- 

 spicuous 



Process of sternum of sixth segment distinctly broader than long, medianly with a 

 broad, subrectangular excision; llagellum of copulatory legs short, very broad at 

 base, the slender portion very short, ending in two subequal, strongly divaricate 

 prongs: Genus Mychodeamua, p. 692. 



