Occasional Papers of the Museum of Zoology 25 



British Guiana, Dunoon: "east trail along river bank, in very 

 damp clay beneath ground litter of rotten twigs and leaves," 

 August 11; sand-hill forest, in rotten wood, August 18; and 

 "second mourie," under dead leaves, August 19, 1914. One speci- 

 men from each locahty. T\T)e, AI.C.Z., 2185. 



ItyphUus Ulacinus Cook, from Sugar Loaf Key, Florida, the 

 only other known species of the genus, has a much larger number 

 of legs, seventy-one pairs, and the anterior margin of the prosternum 

 is more deeply and angularly excised, etc. In some respects, 

 such as the form of the posterior region of the body, very similar to 

 Taenlolinum setosum Pocock, a small form from St. Vincent 

 having forty-nine pairs of legs; but the antennae of this form are 

 short and distally attenuated, much as in Orphnaeus, and the 

 ventral pores are said to be transverse, so that the two species can 

 scarcely be congeneric and quite likely do not belong to the same 

 family. In several respects Taeniolinum suggests Diplethmus 

 of the family Schendylidae. 



. SOUTIGERIDAE 



Pselliodes, gen. nov. 



Pselliophora Verhoeff, Sitzimgs-Berkhten der Ges-naturf. 

 Freunde, 1904, No. 10, 259 (name preoccupied by Pselliophora 

 Osten-Sacken, Diptera, 1886). 



Genotype. — P. colomhiana, sp. nov. 



Pselliodes colombiana, sp. nov. 

 Plate V, Fig. 25 



Resembling P. nigrovittata (Meinert) and P. cavincola (Chamber- 



lin), though readily distinguishable by differences in coloration. 



Dorsum black with a narrow median longitudinal stripe of orange, 



the stoma saddles dusky or fuscous, the color of the latter deepest 



bordering the stomata; with no continuous pale stripe along 



lateral margin of plates such as present in nigroviitata, this being at 



most represented by a small orange spot in each anterolateral 



corner. The median orange stripe on head narrow, its edges 



