( «15 ) 



Thorax. — Tlie luetaiiotnm bears tlireo rows of bristles, iiiid no lulilitioiiiil 

 bristles as in Piilex a/istralis. 



Legs. — The first sei^ment of the midtarsus is tliree-fiftlis the length of the 

 second. The second segment of the hindtarsns is fonr-fifths the length of the 

 first. 



Modified Segments. — The ninth tergite of tiie c? bears three stont, spine-like 

 bristles instead of two. The ninth sternite of the d is mncli larger, and bears 

 more bristles (PI. X, fig. 32). 



Length : c?, 2-" mm. ; ? , 3-7 mm. 



We have twenty-seven exam])les of this, as follows : 



2 Si, Sontliern part of Bnenos Aires. M/tlflia sfjjtt'meuictd. Dr. Berg. 



" + + ? j» ?5 '; JJ Jj J) J) 



4 (?(?, Minas Geraes. A. Kennedy. 



14 T + , ,y )) 1j ,J 



1 S, Sapncay, Paraguay. Aguti. W. Foster. 



10. Pulex concitus spec, no v. (PI. X. fig. 38. 40). 



¥ . This species comes also close to Pulex australits, but is much smaller, and 

 the bristles of the body and legs are less heavy. 



Head. — The maxillary palpus is much shorter than the rostrum ; the second 

 segment equals the fourth segment, while the third is about one-third longer. 

 The rostrum reaches to the apex of the forecoxa, being much longer than in 

 Pulex australis. The last (fifth) segment of the labial palpi composing the 

 rostrum is half as long again as the fourth, while the third segment is much 

 shorter than the fourth, being about one-third the length of the fifth and equal 

 in length with the second. There are two bristles beneath (he eye near the 

 ventral edge of the head. 



Thorax. — The anterior row of hairs on the pronotum extends farther down 

 than in Pulex australis. On the metanotum there are three rows of hairs as in 

 that species, but no additional hairs on the back. The metanotum bears a comb 

 of very short teeth at the apex, the number of teeth being eleven and eight in 

 our two specimens.- The epimernm of the nietathorax has two vertical rows of 

 bristles, the numbers being in one specimen four and four, and in the other four 

 and three. 



Abdomen. — The abdominal tergites bear eai'h two rows of bristles, the first 

 row being complete like the second, its most ventral bristle standing below tlie stigma 

 on nearly all the tergites. The first tergite has a comb of thirteen teeth in one specimen 

 and seven in the other, while the second and third tergites bear four teeth each 

 in one specimen and three respectively one in the other specimen. The long apical 

 bristle of the seventh tergite is not accompanied by a fine hair on either side. 

 The triangular projection of the apical margin between tlie long apical bristles is 

 much more obtuse than in Pulex australis. The sternite of the second segment 

 (basal sternite) bears a patch of thin hairs on the side, and three or four longer 

 ventral hairs. On the next sternite there is a I'ow of five or six bristles, with a 

 few short hairs in front. The sternites 4 to bear a row of four to six bristles 

 while the seventh has a curved row of six or seven and some short hairs in front) 

 the uppermost bristle being long. 



Legs. — The hindcoxa is longer at the meral suture than it is broad, being 



