DIPTERA. 337 



at least in one of the sexes, and the third is lenticular and trans- 

 versal. 



The palpi project *. 



Leptis, Fab. Meig. — olim Rhagio, Fab., 

 Where the last joint of the antennae is almost globular or ovoid, 

 always terminated in a point, and never transversal. 



In some, the antennae are shorter than the head, and their three 

 joints are nearly of equal length. 

 Here, the palpi project. 



Such are the Leptis, Macq,, Avhere the third joint of the antennae 

 is ovoid or pyrifonn. 



L. scolnpacea ; Musca scolopacea, L. ; Nemotele becasse, De 

 Geer, Insect., VI, ix, 6. Thorax black; abdomen fulvous, with 

 a range of black spots on the back ; legs yellow ; wings macu- 

 lated with brown. Very common in woods. 

 There, the palpi are raised vertically, forming the Chrysophilus of 

 that naturalist, and united to Atlierix by Fabricius. 



In the others, the antennae are as long as the head, the first joint 

 elongated and cylindrical, the second short, and the third conical ; 

 the palpi are turned up. The posterior thicker than in the preceding 

 subgenera. The abdomen is linear. 



L, vermileo; Musca vermileo, L.; Neviotele ver-lion, De Geer, 

 Ibid., X. Resembling a Tipula; yellow; four black streaks on 

 the thorax ; the abdomen elongated, Avith five ranges of black 

 spots ; wings immaculate. 



The larva is almost cylindrical ; its anterior portion is much 

 the smallest, and there are four mandibles on the opposite extre- 

 mity. It resembles a'stick-like geometra (caterpillar), and is 

 equally rigid when Avithdrawn from its domicil. It bends its 

 body in every direction, advances and moves about in the sand, 

 and excavates there an infundibvdiform cavity, at the bottom of 

 which it secretes itself either entirely or partially. If an Insect 

 be precipitated into the trap it rises suddenly, clasps it with its 

 body, pierces it with the stings or hooks of its head, and sucks it. 

 It flings away the carcass as well as the sand, by bending its body, 

 and then suddenly relaxing it, like a bow. 

 The pupa is covered with a layer of sand. 



M. de Romand, paymaster-general at Tours, who makes a par- 

 ticular study of the Insects in his vicinity, has again observed 

 the metamorphoses of this Insect, and sent me several living 

 larvpe, some of which I preserved in that state for three years f. 

 The Clinocerse — Clinockra — of Meigen, by their wings, seem to 

 belong to the foUoAving division. 



The other Tariystoma of our second division have their AAings in- 

 cumbent on the body, and exhibit at most but tAvo complete or closed 

 cells. The antenmB terminate in a palette, almost alAA'ays accom- 



* See the works just qiiote'l. 



f For <-'ie other species, see Fabricius, Meigen, and Mncquart. 



