80 



lug any involuutary luigTations from regious subjected to great muscular 

 disturbance. They may also assist in burrowing, though advance or 

 head movements do not appear to be habitual with these larvae, as they, 

 in common with most ectodermic parasites, are not anaerobic (to use a 

 Pasteurian phrase), but require the presence of atmospheric oxygen for 

 their maintenance. 



As regards the disposition of the spines it is a noticeable fact that they 

 differ markedly as to their arrangement according to the aspect of the 

 parasite examined. Thus, as is plainly shown in Fig. 10 {a and &), the 

 three rows of spines are single on the ventral and double on the dorsal 

 aspect, the point where the double row ceases being plainly shown in 

 a. This peculiarity is also distinctly exhibited in the species illustrated 

 by Fig. 11, plainly indicating the relationship that exists between them. 



The only segments that are distinctly outlined are the first, which 

 represents the cephalic end, containing the oral cavitj', armed with two 

 styles. Fig. 10 {aj, and the second, which immediately follows it. As 

 these specimens have shrivelled considerably since the time of extrac- 

 tion, the segmentation is not as plainly visible as it should be. 



The caudal extremity is also distinctly shown, though the details of 

 the stigmatous organs are not as plainly delineated as desirable, as the 

 stigmata are doubtless hidden within the anal fissure. In this respect 

 they differ from Brauer's (Fig. 11, a, h, c) and Coquerel's (Fig. 11, d) 

 specimens of similar larvae, with which they otherwise appear to be 

 closely related. 



■WW"',.." ,> 



/ 



V ■ )A 



„• • • I •• ■ 



Fig. 11. — a, Brauer's fiynre of entire Dcnnatohia larva, snpiiosed to ho closely allied to .specimon.<5 .<;liown 

 in Fig. 10; b, cephalic extremity; c, caudal extremity of same specimen; d, Dcnnatohia larva tig- 

 ured by Coquerel, and closely related to if not identical with precedinji. only seen under a lower 

 power and i)i'rlia])s in an earlier period of development. (From (igiires kindly furnished by the 

 U. S. Entomologist.) 



In addition to the three rows of booklets, a large number of small 

 punctiform and blackisli tuberosities are seen dotted in a somewhat 

 concentric manner above the upper row on the two upper segmeiits 

 and the vicinity of the oral point. 



