^-^ IXSECTA. 



Shigidcs, \\'\i\c apart, Irniiitiaterl Ly an a^vl-shappd joint ; tlie proboscis is orilinarilv very sliort, scarcely 

 advanced in front of the Iicad, often received into the oral cavity, and terminated by a small thickened 

 part tViriiied nf the hi)s. The palpi are generally hidden, filiform, and each is attached to one o^ the 

 setie i)f tlic rostrum. The abdomen is squarer than in Bombylius. These insects are generally very 

 hairy. Their lial)its ai'C very similar to those Diptera. They often alight on the ground, upon walls 

 cxjioed t(i llic snn, along which they are often observed flying, as well as upon leaves. 



Slygides, Latr. (Lomatia, Enc. M^th., Stiigia, Meig.)- has tlic antennas wide apart at the base. 



In all ilie others they are Avide apart at the base. 



Some of these have the head sub^dobose, with the proboscis short, and the extremity of the wiiig^s not 

 retiouliited. 



Anthrax pri per, with the ocelli contig;nous ; [a very numerous ^enus, having; the winp^s generally spotted]. 



IJinnniK'Hvi, ^Vied., with the anterior ocellus at a distance from the other t\vo, and the proboscis retracted. 



The iithcr^ h;i\e the head shorter, subhemispherical, the proboscis longer than the head, and the extremity of 

 the wiii^-v nrrm strongly reticulated. 



Mulio, Latr., has the win{i:s reticulated in the usual maunei', and the proboscis but little longer than the head. 



x^cinestrhio, Latr. [Cijthcrea, Fabr.), lias the extremity of the wings reticulated, as in the Neuroptera, and tVte 

 proboscis much longer than the head; the two basal joints of the anteunce very nearly equal, and the last very short 

 and conical ; the tarsi have three pidvilli. 



Fal/cnia, Aleig., is tbrmrd of two species of Nemcstrina, which scarcely dilTer from Anthrax in the reticulation 

 of the wings. 



Co/aa-, Wied., also appears to us to approach the terminal Anthracii in the anterjns? and ^vi^gs, be.t the oral 

 cavity is closed, as in CEstrus, and the ocelli ai'e wanting. 



Our second general dJvisirnt of the Tanystoma has the proboscis mendjranous, with tlie basal part 

 generally very short, terminated by two lips, very distinct, and ascending. The larvaj of the terminal 

 Diptera of this division have the head of a variable form. 



Some of these [Lcptides) have the wings extending, and exhibiting many complete cells; the 

 antennce do not terminate in a plale, and tlie palpi are hiiform or conical. 



Tkereva, Latr. {Bibio, Fab.), has the palpi withdrawn into the oral cavity ; the antenna: are fusiform or elongate- 

 conic at the tips, with a small articulated terminal style. Type, Bihlo pleheia. Fab., which is found on plants. 

 The larva of T. h'lrta, De Geer, lives in the earth, and resembles a small Serpent ; its body is white, and pointed 

 at each end. it entirely stri])S off its skin on af^.suming the ptipa state. 



In the others the palpi nre e\terior, and the last joint of tlie antennae is either globose or kidney-shaped, ovoid 

 or conic, and terminated in all by a U)ng seta. The tarsi liave three pulvilii. Sucli is 



Leptis, — 

 WHiich is divided into numerous subgenera. 



Atherix, Meig., has the basal joint of the antenna; larger that] the second ; thick, at least in one sex, and with 

 the third joint lenticular and transverse ; the palpi are porrected 



Leptis, Fab., formerly Rtiaf/io, Fab., has the terminal joint of the antenna: subglobose, or ovoid, always termi- 

 nated in a point, and never transverse. In Leptis, jMacquart, the antenna? are shorter tlian tin; head, with the 

 three joints nearly equal in size, and the palpi porrected. Type, Musra scnh/paccn, Linn., a ver\' cinnnuju species. 



Chrysopilus, Macq., differs from the last in having the palpi perpendicalarly elevated. 



[Vermileo, Macq.], has the antennte as lono^ as the head, with the tir.st joint cylindric, the second short, the third 

 conical, and tlie palpi recurved. Type, Musca Verm/leo, Linn. [Vermileo De Geeri, Macq., a species common in 

 France, but not discovered in England]. The larva is cylindrical, with the front of the head attenuated, and four 

 fleshy lobes at the other end of the body. It gives to its body all kinds of curvatures, crawhug on the sand, in 

 which it forms a conical burrow, at the bottom of which it conceals itself, either entirely or only in part, suddenly 

 starting when an insect falls into the hole, and twisting itself round it, thrusting the hooks of its head into its 

 body and sucking its juices. It tlien tlu-ows the carcase away, as well as the sand, by cur\'ing its body into an 

 arch, and then suddenly letting it go. The pupa is concealed beneath a layer of sand. 1 ha\e Kei-t some of these 

 larvae, sent me by 3M. de Romaud, for neaily three yeais unchanged. 



Ctiiior<:ra, Meig., from its wings, appear^ in brinng to the next di\ision. 



The other Tanystoraa of our second division have the vrings incumbent on the body, and only exhibit 

 two complete or closed cells. The antenna: terminate in a palette, nearly always furnished with a seta. 

 The palpi, in the majority, are flattened, and rest on the proboscis. 



These characters, a compressed body, triangular head, slightly advanced like a muzzle ; the abdumen 

 curved lieiicatli, and long slender legs armed witli spines, particularly di:^tinguish the genus 



DoLici-iopus, Fal)., Lair., — 

 Which now forms a small tribe, distributed by iVIacquait in a very natural maimer, which we have 

 adopted, except in rever.>iug it, whereby Ortboehile is brought to llie bead. 



