neio Tropical and Southern Opiliones. 435 



Measure7nents in millimetres. — ^ . Total length 3 ; femur 

 of first leg 9^ of second 16 (entire appendage about 50), of 

 third 10, of fourth 13. 



Loc. Guatemala: the BarrancoSj Guatemala city (0. Stall). 



Prionostemma citrinum, sp. n. 



Colour. Dorsal surface pale (almost lemon-) yellow, with the 

 ocular tubercle black, and a longitudinal black stripe on each 

 side of the abdominal shield ; palpi, coxfe, and sternal surface 

 also yellow, trochanters black, legs dark blackish brown ; 

 mandibles yellow proximally, blackish distally; apes of 

 maxillary process of first leg black. 



Dorsal surface closely granular; ocular tubercle as in 

 P. insculptum ; ventral surface and coxae much less granular 

 than in the foregoing species; the coxas without distinct 

 marginal tubercles. 



Palpi much smoother than in the other species ; the patellar 

 process shorter and blunter. 



Measurements in millimetres. — Total length 3'5 ; femur of 

 first leg 10, of second 17 (entire appendage about 78), of 

 third 9, of fourth 13-5. 



Loc. Brazil : Lages. 



The species here referred to Prionostemma differ from the 

 two species described by Loman (Zool. Jahrb. Syst. 1902, 

 pp. 178-179) in the weakness of the denticulation of the 

 ocular tubercle and the shortness of the patellar apophysis. 

 They may be distinguished as follows : — 



«. Carapace and dorsal scute with sculpturing of 

 pits and ridges. 

 a}. Ocular tubercle nearly smooth, with only 

 a few granules. 

 (i^. Coxfe yellow, that of foiu'th leg with 



golden patch ; dorsal surface dark .... scintilhms. 

 b^. Coxee blackish, no golden patch on 



fourth ; dorsal surface pale hicolor. 



6'. Ocular tubercle with numerous small 



denticles insmlpfum. 



b. Carapace and dorsal scute with granular sculp- 

 turing. 

 «^. Ocular tubercle weakly and irregularly den- 

 ticulate ; patellar apophysis much shorter 

 than half the length of the segment .... citrinum. 

 P. Ocular tubercle strongly and regularly den- 

 ticulate ; patellar apophy.sis equal to half 



the length of the segment coroyiatum & wiicohr, 



Loman. 



31* 



