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VOL. 53. 



but becoming pushed more and more to one side in the succeeding 

 instars until, in the adult, the emargination may overlap the chitin- 

 ous thickening of the side of the head (fig. d). 



The species is strikingly marked with pitchy bands and chestnut 

 blotches on a clear ground. The head is quite conical, a little longer 

 than broad, with pitchy occular and antennal bands, the latter ex- 

 tending forward to the anterior margin of the clypeus. The clypeal 

 emargination is quite deep and extends obliquely from left to right; 

 it is contained entirely vvdthin the clear, thin central portion of the 

 clypeus, though sometimes may be pushed slightly over the chitinized 

 margin of the head at the right; the clypeal signature is entirely 

 lacking. The sides of the head, in front of the prominent, clear 

 trabeculae, are concave; antennae with second segment longest and 

 lighter in color than the three short terminal ones. The temples are 

 broad and well rounded, and bear a long hair and three short spines; 

 occiput almost straight with a large, prominent brown signature. 

 The thorax is shorter and narrower than the head, with pitchy in- 

 ternal bands. Tarsi with one of the two claws much reduced (fig. h), 

 clear and inconspicuous. Abdomen of female elliptical with pitchy 

 lateral bands and peculiarly shaped blotches on the dorsum, which 

 may be somewhat confused by the presence of median transverse 

 blotches which show through from the ventral side. Genital blotch 

 saddle-shaped (fig. c), broadest in front, with two small dark 

 blotches on the posterior end and two curv^ed, linear blotches, one on 

 either side at about the middle. Body of male much shorter than 

 female with more rounded abdomen. Measurements of the female 

 are given ; the male specimen appears somewhat immature. 



Mensuremcnts of female. 



LITERATURE CITED. 



1847, GiEBEL, Insecta Epizoa, p. 119, pi. 8. figs. 12 and 13. 



ISSO. PiAGET, Les Pediculines, p. 70. 



1903. Cakkiker, Mallophasa from Birds of Costa Rica, University Studies, 

 vol. 3, No. 2, p. 17, pi. 2, fig. 5. 



1914. Harkison, Tlie Mallophaga as a Possible Clue to Bird Phylogeny, The 

 Australian Zoologist, vol. 1, pt. 1, p. 3. 



