554 MODERN CLASSIFICATION OF INSECTS. 
formation of the antennz and wings, they very nearly approach the 
Dolichopidx, with which some of them were united by Latreille in 
the Genera Crustaceorum. ‘The body is, however, flattened ; the head 
hemispherical, and almost entirely occupied by the eyes in the males ; 
the legs are short, the posterior tarsi are dilated at the base in some 
genera ; the labium is thick, and terminated by large lips; the palpi 
long, and thickened at the tips; the sete of the mouth minute 
(fig. 130. 15. mouth of Scenopinus) ; in some the antenne want the 
seta; in others the seta is terminal, and in some dorsal; the veins of 
the wings are few in number compared with the other groups of Ta- 
nystoma. 
The tribe is of difficult location, but it appears to me that it is at 
the confines of the Tanystoma and Athericera that the groups of 
which it is composed ought to be arranged; the determination of this 
point will depend in a great measure upon the nature of the trans- 
formations of the insects. We learn, therefore, from Bouché’s figures 
of the larve and pupe of Scenopinus senilis, that it is a Tanysto- 
matous insect, the larva so exactly resembling that of Thereva plebeia 
(fig. 129. 20.), that I have not thought it necessary to refigure it. The 
pupa (fig. 130. 16.) is of the incomplete species, long, narrow, with 
the abdominal segments much constricted, and of nearly equal width ; 
each of them is furnished with two rows of spinule, and the body is 
terminated by two long curved sete ; the head has two short horns in 
front. The larva was found in the rotten fungi of willows. 
The larva of Platypeza boletina observed by M. Van Roser, and 
which he says resembles some seed (Gelbrubensaamen, Wart. Dipt. 
p. 11.), resides in rotten mushrooms. I am indebted to him for a 
specimen of the larva represented in fig. 130. 17.; it is flat, with 
the sides of the body furnished with curved rigid sete. I should 
conceive that the pupa would be a coarctate one. 

The fourth stirps of the Diptera, or the ATHERIcERA of Latreille, 
has the antennz composed of two or three joints, the last of which is 
never annulated, but is terminated by a style or seta; the proboscis is 
generally elongated, thick, and membranous, with two large labial 
lobes ; it is elbowed near the middle, with the palpi (which are com- 
posed of a single piece, and entirely concealed when inactive) in- 
serted a short distance before the bend of the proboscis, which is 
