388 



DIPTERA. 



towards the tips of the joint, and the hind tarsi are a little 

 dusk3^ Its length is .10 of an inch, not including the au- 

 teunai. It may be called the 3Ii/cetobia sordidu. 



PuLiciD.E Westwood. While this group has been considered 

 by many writers as forming a distinct ''order," or suborder of 

 insects, equivalent to the Diptera, under the name of Aphanip- 

 tera, we prefer, with Straus Durcklieim, to consider them 

 as wingless flies, and perhaps scavcoly more abnormal than 

 Kycteribia or Braula. Instead of placing 

 them at the foot of the suborder, we prefer, 

 in accordance with a suggestion made by 

 Ilaliday (Westwood, Class. Insects, vol. 

 ii, p. 495, note), who places them near the 

 Mycetophilids, or " fungi vorous Tipulids," 

 to consider them as allied to that group. 

 The body is much compressed ; there are 

 two simple e^'es which take the place of the 

 compound ej'es, the epicranial portion of 

 ^'^ ^°^ the head being greatly prolonged, Avhile the 



labrum is wanting, and the labium is small and membranous ; 

 the four-jointed labial palpi, always absent in other diptera, 

 are long and slender. The form of the larva, including the 

 shape of the head and its habit of living in dirt, and its waj- 

 of moving about, as also its transformations, certainly ally the 

 flea with the M3xetophilids. 



We have received from Dr. G. A. Perkins of Salem, the eggs 

 and larvic of the species infesting the cat, from which we have 

 also hatched the 3'oung larva?. The eggs (of which, according 

 to Westwood, eight or ten are laid by one female) were shaken 

 from the cat's fur, whence they are said to fall upon the floor 

 and there hatch, the larva? living in the dust and dirt on the 

 floor, and feeding on decaying vegetable substances. The 

 ogg is oval cylindrical, and one forty-fifth of an inch long. 

 Tlie larva when hatched is .OG of an inch long (Fig. 309, the 

 larva four da3's old ; a. antenna ; b, end of the body) white, 

 cylindrical, the sides of the ])ody being a little expanded, 

 giving it a slightly flattened appearance when seen from above. 

 The segments are rather convex, the sutures being deeph- im- 



