82 EAST AFRICAN POLTDESMOIDEA—COOK. 



arranged translatious of the original descriptions of all the species have 

 been added and the figures redrawn, except in some cases wliere they 

 are so imperfect as to be of no use in identification. Hence the pres- 

 ent paper may claim to be a monograph of the East African Polydes- 

 moidea as complete as is now practicable. 



The notes and drawings of the species in the Berlin Museum were 

 made during a visit in May of the present year, twelve months after 

 the work on the material collected by Mr. Chanler had been completed. 

 The Berlin Museum contains all the types of East African Polydes- 

 moidea thus far described. A new species, Orodesmus forceps, is de- 

 scribed, at the request of Mr. Pocock, from a specimen in the British 

 Museum; as this was the only mature male of the genus then access- 

 ible, Mr. Pocock's kindness gave the opportunity of completing the 

 generic description. 



ANALYTICAL KEY TO THE TROPICAL AFRICAN FAMILIES OF POLYDESMOIDEA. 



Body minute, contractile into a conii)letely closed sphere, in wliich the head and 

 first segment are included between the decnrved lobes of the enormously enlarged 

 second segment: Family Ammodesmid.e, type Ammodesmus (jvannm. 



Body small to large, not capable of being more than spirally coiled; second seg- j 

 ment not specially enlarged ! 



Last segment rudimentary, included and concealed by the penultimate;, first seg- 

 ment clypeate, entirely concealing the head; segments densely setose, and with 

 large processes or coarse tubercles; repugnatorial pores on special stalks or lobes : 

 Family Stylodesmid/E, type Siylodesmus horridus. 



Last segment not concealed; first segment short or tiabellate; repugnatorial pores 

 not on stalks or special lobes 



Carinte strongly decurved; body capable of being coiled into a close spiral; dor- 

 sum roughened with clusters of large tubercles or numerous longitudinal carin;e : 

 Family Campodes.mid.e, type Campodesmus carhonarius. 



Carina? distinctly horizontal; body not capable of being closely coiled 



CariniB very broad, without thickened margins; repugnatorial pores remote from 

 the hiteral margin, located in the anterior part of the snbsegment; head concealed 

 under the expanded first segment: Family Cryptodesmid.e, type Criipiodesmus 

 olfersii. 



Carina^, if well developed, with a distinct thickened margin or iutramarginal 

 ridge bearing the repugnatorial pores ; head not concealed 



Anterior legs of males with a fleshy sole at apex, immediately above the claw; 

 sternum of sixth segment of males with one or two large processes; fifteenth or 

 sixteenth segments of males sometimes with sternal processes; penultimate segment 

 very short; dorsum smooth, with no traces of granules or tubercles: Family Gom- 

 PHODESMiD^E, ty^ie Gomphodesmus castanens, Berlin Museum. 



Anterior legs of males without fleshy soles; no j»rocesses from the sterna of the 

 sixth and fifteenth segments 



Lateral surface of segments smooth above the bases of the legs, with distinct 

 longitudinal or oblique carina; body slender; dorsum smooth; lateral carina? 

 email: Family Strongylosomatid.e, tyi^^. Stroii;iijlo8oiiHi pallipes. m 



