the Early Staijen of P.iltosfotna scliiiicii. 1'.'7 



end; til)i:i and tarsus KJinilarl) darkened. Midillf ami 

 him/: coxa and femur |):de, the latter with two hroad ill- 

 (ietiiicd blaekish l)aiids, the one beyond theniiddh', the other 

 a little remote from tip ; tibia very slij^litly sulTnsed, with an 

 oraiijje ciid-s|)ine to hind pair. All the tarsi are blackened 

 and bear bristly hairs; the elaws are well (level(Ji)ed, blaek, 

 with a minute spine or accessory claw at the base. of each. 



Abdomen ( fi;;s. IG, 17). — Somewhat flattened sideways; 

 viewed dorsally the sejrinents arc dull brown, darkened a 

 little on the shari)ly dcHued distal margins ; the .segment 

 before the genital ones has a fringe of longish yellow hairs. 

 In side-view the segments are pale for about the proxim il 

 two-thirds, the rest is as the dorsum. The venter is strongly 

 differentiated from the siiles, ridged at each distal edge of a 

 segment ; the whole i.s densely scaled or pollinated, tin; 

 raised distal margins being orange and brown, the depressed 

 iuters])aces silvery. The lower genital segments are rathir 

 shining orange and ehitinized, the upper ones are like tne 

 dorsum. 



Length about 3^ mm. II Ing-lenr/th about 5 J mm. 



VII. GkOGKAPHICAL COXSIDERATIOXS, AlllNITIES, ETC. 



Three species of Paltostoma arc known : P. superhienx, 

 Schincr, from Colombia, known only in (J sex ; P. schiner'i, 

 Williston, the subject of this paper, St. Vincent and Trinidad, 

 both sexes now known; iind P.be/lardii, Bczzi, from Mexico, 

 known only in :^ sex. 



It is worthy of note that P. schiiieri occurs in both 

 St. Vincent and Trinidad, though tlic two i.slands belong to 

 completely dillVrent formations. St. Vincent is one of the 

 volcanic chain of the Antilles, while Trinidad is merely 

 a detached fragment of the South-American continent. 

 St. ^'inccnt is roughly 150 miles north of Trinidad, and 

 there is an unbroken gap of nearly 00 miles between Trinidad 

 and Grenada, the southernmost and nearest of the Antilles. 



Bczzi {op. cit. IDl-'J, p. 72), in mentioning the deductions 

 wliieh have been drawn from the geographical distribution of 

 IJlcpharoceridie, remarks that there are as yet many laeuiue 

 in our knowledge, and that many additional forms will 

 prabably be brought to light in the great continental 

 mountain-ranges and in those of many islands. The present 

 writer would certainly eiulorse the opinion that this |)ossi- 

 bility exists, ^^'itll reference to the Antilles in particular, 

 any one who ha.s viewed these mountainous islands, even 



Ann. .f- .lA/y. .V. ///.v/. Scr. S. Vol. XV. 14 



