S94 INSECTA. 



Geoffroy has confounded the above genus with Asilus *. 

 Geron, Meig. 



This genus appears to be distinguished from Bombylius only by 

 the more remarkable elongation of the last joint of the antennae and 

 its subulate termination, and by the wings, which have onetransverse 

 nervure less near the posterior margin, so that the number of the 

 closed cells of that margin is less f. 



The genus Thlipsormyza of Wiedemann — Dipt. Exot,, I, iv — ap- 

 pears to approximate to the preceding Insects and to Phthiria. That 

 called Amictus, I presume, also approaches them ; in both the first 

 joint of the antennae is longer than the second, and cylindrical, a 

 character which approximates them to Geron. The wings in Amic- 

 tus, however, are someAvhat different from those of the preceding 

 genera. 



In the other species the proboscis is, at most, as long as the head, 

 and inflated at the end ; the first joint of their antennae is the largest 

 of all. Those, in Avhich it much larger than in the following ones, 

 form the genus 



Ploas, Conophorus, Meig. ^, 



And those in which it is simply larger, without any remarkable in- 

 crease of thickness, the 



Cyllenia §, 

 Where the abdomen is more elonged and almost conical. 



Anthrax, ^crop.,Fab. — Musca, Lin. — Anthracii^ L«f., 



Similar to Bombylius; but where the body is depressed, or but 

 slightly elevated and not gibbous, with the head as high and as broad 

 as itself. The antennae are always short, and, in the Stygides alone 

 excepted, distinct from each other, and always terminated by a subu- 

 late or punch-like joint. The proboscis, except in a small number, 

 is generally short, extending but little beyond the head, frequently 

 even withdrawn into its oral cavity, and terminated by a little infla- 

 tion formed by the lips. The palpi are usually concealed, small, fili- 

 form, and each, at least in several, adhering to one of the threads of 

 the sucker. The abdomen is less triangular than that of the Bom- 

 bylii, and partly square. These Insects are generally hairy. Their 

 habits are very analogous to those last mentioned. They frequently 

 alight on the ground, on walls exposed to the sun, and on leaves. 

 Some approximate to the Bombylii in their antennae, which are 



* Lat., Gener. Crust, et Insect., IV, 314. See also Latreille, Meigen, Fabricius, 

 Macquart, and Olivier, article Bombille. The genera Corsomyza and Tomomyza of 

 Wiedemann — Dipt. Exot. — are unknown to me. lu the first, the last joint of the 

 antennae is twice the length of the preceding ones, and compressed and dilated at 

 the end. The second appears to approach Cyllenia and Mulion, 



f See Meigen. 

 I + Lat., Gener,, IV, 312; Fab., Meig., Macq. 



§ Lat., Ibid., and Meig. 



