DUBLIN UNIVERSITY ZOOLOGICAL AND BOTANICAL ASSOCIATION. 195 



maxillse are broad, composed of several pieces united, the internal lobe 

 striated, and with a fringe of long hairs, the apex furnished with a 

 jagged hairy process, probably representing a palpus. These maxillae 

 are frequently in lively, oscillating, parallel and alternate motion. 



The pupa, much contracted in length, retains otherwise the general 

 form of the larva. 



The alimentary canal of the larva is more than three times the 

 length of the body, and much convoluted ; the ventricle, which occu- 

 pies fully two-thirds of the whole, is attenuated at the points of flexure ; 

 anteriorly it expands into two pear-shaped chambers in contiguous suc- 

 cession, the first opening into the slender oesophagus. The four long 

 and slender Malphigian vessels, with free ends, unite into a short but 

 ample common duct before their insertion at the pylorus ; the small 

 intestine is slender, and only twice as long as that duct ; the colon is 

 abruptly enlarged into a pear-shaped muscular pouch, of a blackish co- 

 lour, traversed lengthwise by pale fibres ; the rectum, which returns 

 on this at first in a contiguous curve, is hot greatly shorter than the 

 body, and expands behind into a pretty ample cloaca. 



The coat of the larva, except the smooth head, is entirely and ele- 

 gantly reticulated with cells nearly hexagonal, only a little transverse 

 on the anterior segments ; the black dots, which are regular in form 

 and imbedded in the substance so as to appear on both sides alike, are 

 in like manner surrounded with their own distinct annulus, and do not 

 break the regularity of the reticulations, but these radiate from them 

 as centres ; so also the circular spaces formed by the origin of the bris- 

 tles. On the other hand, the cloudy markings are equally indistinct 

 on each side of the skin, and appear to be due to a pigment interposed 

 between its layers. 



This larva is common under dried-up Cohfervae and other vegetable 

 matter strewed on the ground, especially in marshy spots on the shore. 

 Having placed some of them in a box with such food, and filled it up 

 with flowers of Seapink as an elastic packing, I found several of the 

 larvae, soon after, feeding very busily, with their heads immersed in the 

 flowers. 



Alysia mwritima (Ent. Mag., vol. v. p. 230) is a parasite of these 

 larvae. 



Anthomyia eipaeia Fallen. 



The fly, which will form the type of a genus allied to Limnophora 

 and Lispe, abounds about the mill-dam where I found the larva of 

 Oxycera. Mr. E. P. Wright, having observed a maggot common amon£ 

 the Confervae on the face of the fall, suggested that it might be the 

 progeny of this fly; which conjecture I have been enabled to verify by 

 rearing it. The larva, which is exposed to a strong current in that 

 situation, nestles deep among the vegetable matter, and is well armed 

 for holding fast. At the end of May I could find very few of them, 

 but the pupae were abundant in the same situation. 



The larva is about 4 lines long when extended, yellowish-white, 

 tolerably transparent, tapering gently in front, obliquely truncated be- 



