368 INSKCTA. 



In Home,sucli as tlie two following subgenera, tlie wings terminate 

 in the same manner as in the preceding ones, or present two com- 

 plete cells between the middle and the edge. 



Ac HI AS, Fab., 

 Remarkable fur the horn-like prolongations of the sides of the head, 

 and approximating in this respect to Diopsis; but their antennte are 

 inserted high on the front, and similar in form and proportions of the 

 joints to those of the Muscae; the wings are distant*. 



Idia, Meiij., Wied., 

 Where the anterior extremity of the head projects in the manner of a 

 horny rostrum; the wings are incumbent on the bodyf. 



In the other two and last subgenera of the Creophilae, the terminal 

 cells of the wings are closed by the posterior margin. The eyes are 

 very remote. The abdomen is flattened. 



LisPE, Lat., Fob., Meig. — Musca, De Geer., 

 Where the body is oblong, the antennre inserted near the front, almost 

 as long as the face of the head, with the I st joint much longer than 

 the preceding ones, linear, and furnished with a plumous seta. 



The wings are incumbent one on the other. The palpi are strongly 

 dilated superiorly, in the form of a spatula, and somewhat exterior. 



These Insects are usually found along the banks of rivers, &c.J 



Argyritis, Lat., 

 Which, in the short form of the body, strongly flattened and almost 

 semicircular abdomen, short, broad head, and distant wings, resemble 

 the Phasiae. The antennae, inserted below the front, are very short, 

 with the last joint a little larger th in the penultimate, almost orbicular, 

 and furnished with a simple and geniculate seta, like that of thr 

 antennae of the Gonise. The palpi terminate in a short, but alm()st 

 ovoid and pointed club. 



I have established this genus on two species of Diptera sent to me 

 by M. Marcel de Serres, and captured by him in the environs of 

 Montpellier. They are small, and furnished with a silvery down, 

 which, in one, covers the whole abdomen. 



Certain species of Tachina, Meig., those, for instance, the type of 

 whose wings, given in fig. 32 of pi. 41, and some of his Anthomiae 

 with large alulae covering the greater portion of the halteres, will 

 re-enter the last division of the Creophilae. 



In all the other Muscides of which we are about to speak, the alulae 

 are small or almost wanting, the halteres are exposed, and the princi- 

 pal longitudinal nervures of the wings extend to the posterior margin, 

 which, except in a very small number, closes the posterior cells, and 

 Qven some others that originate near the opposite extremity. The 

 wings, in most of them, are incumbent, one on the other. 



* Fab., Syst. Aiitl. 



t See Meig. and \Vi*d., Anal. Entom. I know two species, one from the Isle of 

 France and the other from the environs of I'nris. We should also refer to this genus 

 the Musca felina of Fabricius, which is found in the south of France. 



X See Lat., Gener., Crust, ct Insect., IV. 347; Dej., Fall., and Meigen. 



