

THE FLIES THAT CAUSE MYIASIS IN MAN 31 



and no outside box for protection, is a dangerous one. and often leads 

 to severe breakage. Any specimen that is worth determination is 

 worth protection in transit. 



If one or a small number of specimens is being shipped, they may 

 be pinned into the corks of shell vials, one to each vial, and shipped 

 in a box with sufficient packing. Vials containing alcoholics, or vials, 

 gelatin capsules, or pill boxes containing unmounted insects may be 

 shipped in the same way and with similar precautions concerning 

 packing between the insect containers and the outer box. 



CLASSIFICATION OF THE DIPTERA 



The order Diptera includes not only the familiar flies of the house- 

 fly and bluebottle type, but also the mosquitoes, midges, gnats, horse- 

 flies, and a number of others, many of which are not familiar to the lay 

 person. There is considerable di>agreement as to their classification 

 in respect both to families and to categories above the family level. 

 There is no need to be concerned, for the purposes of this work, with 

 much other than the family classification: and as to that, a rather 

 conservative system is here used. Most of the flies involved in myiasis 

 belong to the muscoids or housefly type (in a broad sense). The term 

 "muscoid" is used considerably in the text, and it will be necessary to 

 keep in mind the two divisions of the Muscoidea — the Acalypteratae, 

 in which the squamae or calypteres as a rule are small, and the 

 Calypteratae, in which the calypteres are well developed. The fami- 

 lies of Acalypteratae discussed here are the Sepsidae. Piophilidae, 

 Tylidae, Drosophilidae, and Ephydridae: the families of Calypteratae 

 are the Oestridae. Cuterebridae, Gasterophilidae. Hypodermatidae, 

 Larvaevoridae. Muscidae (including the Anthomyiidae), Calli- 

 phoridae. and Sarcophagidae. The families of the Calypteratae. with 

 the exception of the Larvaevoridae. are of major importance. 



The keys that follow were constructed for the purpose of aiding in 

 the identification of the myiasis-producing flies. They cannot, there- 

 fore, be relied upon in the case of genera other than the myiasis-pro- 

 ducing ones of families treated in this work. An attempt has been 

 made to use phylogenetically significant characters whenever feasible, 

 but the main purpose of presenting the keys has been utilitarian. 



KEYS TO FAMILIES OF DIPTERA 



ADULTS 



1. Antenna consisting of more than 3 segments: if apparently only 3, the 



third is compound, formed of several annuli, or with an annnlated 

 apical style 2 



Antenna apparently 3 segmented, the third segment bearing a dorsally 

 placed arista . 6 



2. Small, mothlike flies, the wings short and broad, long-haired, pointed 



(fig. 84, .4), and folded rooflike over the body when at rest : discal cell 



incomplete; ocelli absent psychodidae 



Larger flies, the wings moderately long, not long-haired or pointed : discal 

 cell well developed 3 



3. Mesonotum with a V-shaped suture, the apex of which is directed toward 



the scutellum; ocelli absent; usually medium to rather large slender 



flies, with very long legs tiiti idak 



Mesonotum without a V-shaped suture: ocelli present 4 



4. Antenna about as long as the thorax, 12 to 16 segmented, the segments 



distinct : posterior cells all open sylvh olidae 



