( lil.S ) 



Length : 6 , '-i'OS lum. ; ? , 27 imii. 



The ? of what, Baker referred to itti ffi-ossiMntris is most indbalily this s|it'(!ios. 



According to the description, tlie four segmeuts of tiic maxilhiry i>al[ins of 

 ffro.ssive/itris Weyeiibergh are tlie same in k'ligth, the tirst being a litth> longer 

 than the others. The fifth tarsal segment has only one pair of si)iMe-like 

 bristles. The thoracical and abdominal tergites bear each only one pair of 

 bristles. The abdomen of the ? has no hairs at the ajiex, and the legs of the 

 same sex have no heavy bristles. 



Weyenbergh calls the coxa trochanter, and the real trochanter femur. 



We have thirty-three examples of this species, as follows : — 



5 (?c?, Cruz del Eje, Argentine, November lOOl. Da)<i///us. V. 0. Simons. 



7 ? ? " 



1 c?, Patagonia. 



3 ??, _„ 



2 d"c?, Rio Santa Cruz, Patagonia. Daxi/pus iniuutus. Dr. Berg. 



2 (JfT, Pamba Central. Ckuctapltiactus minutus. „ 



2 Si, Rio Negro, N. Patagonia. Chfictnphnwtus miiiutKs. ,, 



4 9 2 



4. Pulex creusae spec. nov. (PI. VIII. fig. 18 ; IX. fig. 25). 



Head. — The head is strongly rounded in front in both sexes, more strongly 

 in the S than in the ? , and is covered on the dorsal surface with numerous pale 

 dots, each bearing an extremely short hair. In the S the occiput is horizontal 

 above and hollowed out iu the middle line, this depression bearing short hairs. 

 The interspace between the most ventral and the second bristle of the apical row 

 of the occiput is twice as wide as that between the second and third bristles. The 

 second segment of the maxillary paljuis is a little longer than the third and fourth 

 together, and the third segment is only half the length of the fourth, being only half 

 as long again as broad. The last segment of the rostrum is little longer than the 

 two preceding ones together, being nearly three times as long as the last liut one. 



Thorax. — The bristles of the thorax and abdomen are thin, but rather long. 

 The cpimerum of the mesothorax bears three rather short and stout bristles, one 

 in front and two behind, and a longer bristle above the stigma. The metathoracical 

 epimerum bears a series of four or five at the hinder edge and a single one towards 

 the base and on a level with the most ventral bristle of the apical row. 



Abdomen. — The thoracical and abdominal tergites bear each a single row of 

 bristles, the most ventral bristle being the longest. The seventh tergite bears in 

 addition a stout apical bristle, accompanied on each side by a very short hair, this 

 apical bristle being shorter than the most ventral bristle of the jjostmedian series. 

 The diameter of the stigma of each tergite is less than twice the length of the 

 diameter of the groove in which the ventral bristle of the tergite is inserted. The 

 stigma stands on a level with or above the second bristle, or, if this bristle is not 

 developed, half way between the first and next, but mucii nearer the base of the 

 segment. In the S the second and third bristles are apparently always absent. The 

 sternite of the second abdominal segment bears one bristle on each side, the four 

 following sternites three or four bristles with a small hair in front, and the sternite 



