Vol, 



189: 



893" ] PROCEEDINGS OF THE NATIONAL MUSEUM. 707 



setigerous i)iiuctation iiejii" the distal end of tlic anterior face of the 

 coxa. 



Color of alcoholic specimens chestuut-brown, alternating with yellow ; 

 anterior portion of each posterior subsegnient brown, the j)Osterior 

 margin and usually a broad dorsal median line, yellow or bnffj feet 

 l^ale reddish, antenn;e chestnut-brown; anterior and ventral portions 

 of segments butt'. In the young the colors are paler and less distinct, 

 so that the general color appears to be a dirty yellow. 



Length of larger specimens (>0 mm., diameter 4 mm.; 61-64 segments. 



Habitat. — St. Paul de Luanda. Mr. Chatelaine's collection contains 

 three female specimens and several others in more or less fragmentary 

 condition. This additional iiuiterial has made necessary some changes 

 in the specific description (pioted above, and many of the characters 

 previously placed in it have been relegated to the new generic descrip- 

 tion. 



The spim^d anal valves appeared to Mr. Collins and myself so remark- 

 able a feature that we were inclined to believe them characteristic of 

 a genus, and rather than establish a new genus we preferred to believe 

 that there was some mistake about IJr. Karsch's statement to the effect 

 that the species described by him under Odeatopyge had no pectinate 

 supplementary margin. Since the former paper was written, the study 

 of a more extensive collection of African Inlidjie has established the 

 fact that the spined anal valves exist in several genera, and are found 

 in forms which have the supplementary margin entire. 



It therefore becomes necessary to distinguish the present and allied 

 forms from the other described groups, and when studied with such a 

 purpose in view, the ditterences from SpirostreptHs are evidently such 

 as to demand a separate description, not merely the establishment of 

 Spfirostreptus, a genus no longer adequately definable by reason of the 

 diversity of forms now referred to it, 



Porath has described five species with pectinate supplementary mar- 

 gins and other characters which render it probable that they are con- 

 generic with the above, and the generic description has been drawn up 

 to accomodate them. They are Ctenoinlus fofeolattis, puncticaudus, 

 aeqiialis, dimidiatus^ mid prwtextus, the last with the apices of the teeth 

 of the suppleiuentary margin connate. As Dr. Karsch has examined 

 the type of ISpiro.streptusdimidiafus Peters, and hnds the supplementary 

 maigin entire, it is probable that Porath's dimidiatna is distinct, and 

 the name should be changed as Dr. Karsch has suggested. 



All Porath's si^ecies are from CattVaria, distant from Loanda by 20 

 decrees of latitude, and the descriptions do not include the characters 

 of the mouth-parts, legs or genitalia, so that their generic affinities can 

 not be determined with confidence, hence it can only be said that from 

 what is known of them they seem to belong to the present genus rather 

 than to any other. 



From the West Coast of Africa three species of Odontopyye have 



