70 Mosquitoes 



exactly with neither of the foregoing groups, and 

 their mouth-parts, as well as other parts, are transi- 

 tional (Figs. 13, b, d, page 6S ; Figs. 14, b, e, page 73). 

 Anopheles larvae will bite each other viciously, tear- 

 ing off hairs, devouring skins, occasionally killing 

 other larvae or smaller Anopheles larvae, and always 

 eating any which die. They snap at any floating 

 object as well as at their brethren, differing greatly 

 in this respect from the milder-mannered non- 

 insectivores, which may often be seen combing 

 carefully over one another, or mutually cleaning 

 mouth-brushes. We found the principal food of 

 Anopheles to be Englena, protozoa, diatoms, spores, 

 etc., but they will also take in any floating object 

 that is small enough, and a good many which are 

 not, rejecting the latter, after a spiteful chewing, 

 with a vicious flip of the head and a snap of the 

 whole body highly expressive of disgust. Urano- 

 tcenia has much the same habits as Anopheles, 

 without the temper. But whereas Anopheles turns 

 his head around a half circle and skims the surface, 

 Uranotcenia feeds just below the film. From the 

 shape of the latter's mouth-parts, I judge it would 

 devour minute Crustacea and vegetables. 



Among the non-insectivores are also two distinct 

 types of mandibles and maxillae. The facts on hand 

 suggest that these are associated with two types of 

 breathing tubes and antennae, as well as with differ- 

 ent habits of feeding. The author hopes that this 

 point will some time be worked out more fully. It 

 is intensely interesting, and the observer will feel 

 himself repaid for patient watching. It seems as if 



