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American Midland Naturalist Monograph No. 3 



dorsally and stout hooks apically; a long stout recurved dorsal spine, a single 

 stout dorso-lateral hair, and a multiple subventral tuft arising before the heav- 

 ily sclerotized portion; pecten absent. Dorsal plate about three times as long as 

 broad and completely ringing the anal segment; lateral hair multiple, inserted 

 well before the posterior margin of the dorsal plate; dorsal brush consisting of 

 a long multiple lower caudal tuft and a moderately long multiple upper caudal 

 tuft on either side; ventral brush well developed, with about four small pre- 

 cratal tufts piercing the dorsal plate; gills 4, shorter than the segment, bluntly 

 pointed. 



distribution. — The distribution of this species is not well known. As 

 pointed out by Pratt (135), many of the records of M. titillans recorded in 

 the literature for the United States may be based on M. indubitans. Shannon 

 (169) has indicated that many of the South American records were not M. 

 titillans. Definite locality records for this species in Florida are given by Cham- 

 berlain and Duffey (38). It has also been recorded from Texas by McGregor 

 and Eads (108). A single record of M. titillans from Alabama was reported 

 by Middlekauff and Carpenter (125), but the specimen has been lost, thus 

 making it impossible to determine its true identity. 



Fig. 64. Larva of Mansonia titillans (Walker). A, Comb scale. 

 B, Terminal segments. C, Head. 



