342 IN8ECTA. 



points at the posterior extremity. It ascends to the surface of 

 the soil when about to divest itself of its skin, in order to as- 

 sume the form of a Tabanus, and protrudes the half of its body 

 above it. Very common near Paris. 



T. maroccanus. Fab. Black, with golden-j'^elloAV spots on the 

 abdomen. — The scourge of Camels, which, according to M. 

 Desfontaines, are sometimes completely covered with these In- 

 sects *. 

 Sometimes the antennae are very evidently longer than the head 

 and terminated by a joint forming an elongated cone, or almost cy- 

 lindrical, frequently presenting but four rings. The ocelli are want- 

 ing in several. 



Some, in which the last joint of the antennae is always subulate 

 and divided into five rings, have three ocelli. 



Those, in Avhich the first joint is manifestly longer than the follow- 

 ing one, and cylindrical; and where the latter is very short, and re- 

 sembles a cup, form the subgenus 



Sylvius, Meig. f. 

 Those in Avhich the two first joints are cylindrical, and almost equal 

 in size, compose the subgenus 



Chrysops, Meig. 

 To this belongs the 



C. cacutiens. Fab. ; De Geer, Insect., VI, xiii, 3, 5. Eyes 

 golden, with purple points ; thorax yellowish-grey, streaked with 

 black ; abdomen yellowish above, with a broad black spot, forked 

 at the end, on the two first annuli ; two others, elongated, and 

 of the same colour on each of the following ones, and three 

 blackish-brown and transversal ones on the wings. They are 

 constantly persecuting the Horse J. 

 The others are destitute of ocelli ; the last joint of their antennae, 

 sometimes cylindrical, presents but four rings. 

 Here, as in 



H^MATOPOTA, Meig., 

 It is subulate, and the first is thick, and almost borders on an oval in 

 the males § . 

 There, as in 



Hexatoma, olim Heptatoma, Meig.., 

 The antennae, longer than in the preceding ones, are cylindrical ; 

 the last joint is much elongated ||. 



* For the remaining species of this subgenus, see Lat., Fab., Meig., Palis de 

 Beauv., Macq., Fallen and Wiedemann. 



t See Meigen. He quotes but a single species, the Tabanus vituU, Fab., and to 

 which he refers his T. italicus. 



X See Fab., Lat., Meig., Fall., Wied,, Macq., &c. 



§ The same authors. 



II Idem. 



