NO. 3569 SOLDIER FLY LARVAE — McFADDEN 11 



B. Food of larva 



1. aquatic microorganisms 



2. plant roots 



3. decaying organic matter (includes microorganisms) 



C. Labium of larva 



1. well developed 



2. not well developed 



D. Distribution of maxillary setae in larva 



1. setae absent 



2. setae present, located in notch 



3. setae present, other arrangement 



E. Types of maxillary setae in larva 



1. cylindrical brushes 



2. cylindrical brushes absent or not cylindrical 



F. Transverse series of dorsal setae with accompanying setae in larva 



1. extra setae present 



2. extra setae absent 



G. Posterior spiracles of larva 



1. with coronet of setae 



2. without coronet of setae 

 H. Anal armament of larva 



1. large teeth anterior to anal opening 



2. large teeth absent 



I. Body conformation of larva 



1. attenuate 



2. parallel sided 

 J. Mandibles of larva 



1. well developed 



2. not well developed 



K. Posterior spiracles of larva 



1. located at apex of last abdominal segment 



2. located on dorsum of last abdominal segment 



These results are presented in graph form in figure 1. The phylo- 

 genetic tree in figure 2 represents the sum of the similarities and dif- 

 ferences among the subfamilies and indicates the relationships of the 

 extant species. 



The Beridinae and succeeding subfamilies of the Stratiomyidae 

 probably arose from a group of the subfamily Xylomyinae that had 

 developed a completely shagreened integument. This separation 

 was no doubt strengthened subsequently by 2 changes in the 

 ecological requii'ements of beridine larvae: a change in habitat 

 (larvae of Beridinae are not found in the same habitat as larvae of 

 Xylomyinae) and a change in food preference (as evidenced by larvae 

 of Actina incisuralis) . 



The subfamily Pachygastrinae represents an advanced group on 

 the basis of adult characters, but the mouthparts of the larvae are 



