450 MR. G. A. BOXJLENGER ON TWO NEW [JunC 3, 



22. ScopoPHOETTs, sp. inc. 



a. Skin without label, too young for determination. 



23. Manis TEMMiNCKii, Smuts. 



a. Mandera. 3/90. Collected by Lieut. Langbeld. 

 I This specimen appears to have an unusually long tail, but as some 

 of the terminal caudal scales have been lost, the exact extent of the 

 variation cannot be recorded. 



4. Descriptions of two new Species of the Siluroid Genus 

 Arges. By G. A. Boulenger. 



[Eeceived May 28, 1890.] 



(Plate XLI.) 



Leaving aside the two or three species in which a spine is present 

 between the rayed dorsal fin and the caudal, whether exposed and 

 supporting the small adipose fin or partly embedded in the skin, and 

 for which the name Stygogenes, Giinther, may be retained, I find, 

 upon examination of the material in the British Museum and after 

 perusal of Dr. Steindachner's descriptions, that as many as six species 

 of the genus Arges are entitled to distinction. They may be easily 

 identified by means of the following synopsis : — 



A. First ventral raj about as long as its distance from 



the posterior extremity of the anal laid against the 

 tail, reaching or nearly reaching the anus. 



a. Barbel half the length of the head. 



Eye equally distant from posterior nostril and 



upper border of gill-opening ; outer pectoral 



ray reaching but a little beyond the base of the 



outer ventral ray 1. prenadilla, C. & V. 



Eye nearer the upper border of the gill-opening 



than to the posterior nostril ; outer pectoral 



ray reaching nearly the extremity of the outer 



ventral ray ' 2. longifilis, Stdr. 



b. Barbel one third or one fourth the length of the 



head ; eye nearer the upper border of the gill- 

 opening than to the posterior nostril 3. sabalo, C &Y. 



B. First ventral ray exactly as long as its distance from 



the anal ; anal opening nearly equally distant from 

 the extremity of tlie ventral and tlie origin of the 

 anal, or a little nearer the former. 

 a. Barbel half the length of the head. 



Eye equally distant from posterior nostril and 

 upper border uf giU-opeuing ; outer pectoral 

 ray not reacliing the middle of the outer 



ventral ray 4. whi/mperi, sp. n. 



Eye nearer the upper border of the gill-opening 

 than to the posterior nostril ; outer pectoral 

 ray reaching beyond the middle of the outer 



ventral ray 5. taczanowskii, sp. n. 



h. Barbel one third the length of the head ; eye 

 nearer the upper border of the gill-opening than 

 to the posterior nostril 6. peruamu, Stdr. 



