Zool— Vol. I.] WHEELER— MARITIME DOLICHOPODIDsE. 151 



lobes. There are twelve well marked segments in the 

 body, and the fifth to eleventh of these, inclusive, have 

 crenulated creeping-pads on their ventral surfaces. There 

 are rudiments of antennae on the first segment, and powerful 

 jaws, each of which is toothed and connected posteriorly 

 with a pair of delicate chitinous rods that extend back into 

 the third segment. Between the ventral and somewhat 

 shorter pair of these rods lies a curved unpaired chitinous 

 element, the function of which is not clear. Anteriorly the 

 trachea? open on the second segment. 



The four large lobes at the posterior end have been seen 

 in other Dolichopodid larva;. They are noted by Beling as 

 occurring in all the forms he examined except Neurigona. 

 This genus seems to have no such processes, and is described 

 as " am Ende kuppelfoermig gerundet." An unpaired 

 dorsal lobe occurs in Argyra. The two pairs of small 

 lateral lobes seem to be peculiar to Afhrosyliis, unless they 

 occur in the larva of MachcBrium, a description of which I 

 have not seen. 



University of Chicago, 

 May 1, 1S97. 



