NOTES ON THE MYIASIS-PRODUCINC. DIPTERA. 249 



5. vSubfamily Cuterebrinae. 



In this subfamily are placed a somewhat heterogeneous collection of genera and 

 species, all the larvae of which are parasitic in the skin and subcutaneous tissues 

 of small rodents, chiefly Muridae ; they are only fovmd in North and South America. 

 Townsend raises the subfamilj^ to a family, the Cuterebridae, and gives the following 

 key to the genera : — 



(1) No facial carina ; antennal pit large and deep ; antennae elongate . . 2. 

 Facial carina present ; antennal pit small and shallow ; antennae short v3. 



(2) Epistoma rather broad, projected obliquely forward and downward 



between the peristomalia ; arista thickly long-plumose to tip 



Pseudogametes. 

 Epistoma very narrow, projected straight downward between the 

 peristomalia ; arista with hairs on upper side only . . Dermatohia. 



(^3) Arista nude . . . . . . . . . . . . . . Rogcnhofera. 



Arista with hairs on upper side and on apical part of lower side . . 4. 

 (4) Antennal pit extended below in a tapering prolongation, the peris- 

 tomalia converging obliquely and meeting near the lower end of 

 carina . . . . .... . . . . . . . . Cuterehya. 



A^ntennal pit circumscribed below, subcircular, the peristomalia 

 parallel and closely approximated to the carina for about the lower 



half of its length Bogeria. 



The following are the more important species : — 



Pseudogametes hermanni, Br., and P. semiatra, Wied., from the subcutaneous 

 tissues of Muridae in Brazil. 



Dermatohia hominis, L. — The larvae of this species are chiefly found in the skin 

 of cattle in tropical America and the neighbouring islands ; man is seldom parasitised. 

 It is now known that the female fly lays its eggs in small batches on the bodies of 

 blood-sucking and sweat-loving insects, such as the Culicid, Janthinosoma lutzi, and 

 species of Anthomyia, and the larvae hatch out when the egg-carrier visits the 

 vertebrate host to feed, penetrating the skin and forming a local tumour. 



Rogenhofera grandis. Guerin, R. irigonocephala, Br., and R. dasypoda, Br., from 

 the skins of Muridae in Argentine and Brazil. Cuterebra americana, F., C. cunicidi, 

 Clark, C. analis, Macq., C. approximata, Walk., C. histrio, Coq., C. tenebrosa, Coq., 

 C. atrox, Clark, and C. maculosa, Knab, all from the skins of small rodents in North 

 and Central America. 



Cuterebra ephippium, Latr., larvae parasitic in the skins of Muridae in French 

 Guiana, C. patagona, Guer., from Patagonia, C. megastoma, Br., from South America, 

 C. funebris from Trinidad, C. apicalis, Macq., C. cayennensis, Macq., C. riifiventris, 

 Macq., C. nigrocincta, Aust., C. sarcophagoides, Lutz, C. nigricans, Lutz, C. inftdata, 

 Lutz, and C. schmalzi, Lutz, from Brazil. Bogeria emasadator, Fitch, B. grisea, 

 Coq., B. buccata. F., B. fontenella. Clark, B. princeps, Aust., B. fasciata, Swenk., 

 B. scudderi. Towns., all from North and Central America. 



From the studies of Hadwen, and Parker and Wells, it seems that these Cutereb- 

 rine bot-flies deposit their eggs on the hairs of their hosts, and that they are then 

 licked off and enter the alimentary tract, later migrating outwards to the skin, where 

 they cause dermal myiasis. 



6. Subfamily Cephenomyinae. 



In this subfamily are included a small number of Oestrids, the larvae of which 

 are parasitic in the nose and accessory sinuses of the Cervidae and Bovidae and one 

 species in the oesophagus of the African elephant. Most of the species are found in 



