NO. 3569 



SOLDIER FLY LARVAE — McFADDEN 43 



2. Midventral line of abdominal segment 6 with a round sternal patch, located 



anterior to transverse row of setae; 8 or more pairs of conspicuous plaques 



along dorsal midline of last segment Berkshiria Johnson 



Sternal patch on midventral line of abdominal segment 6 oval, located between 

 setae of transverse row; no more than 3 or 4 pairs of conspicuous plaques 

 along dorsal midline of last segment Neopachygaster Austen 



3. Each thoracic leg group with 2 setae (fig. 140) . . . Eupachygaster Kertesz 

 Each thoracic leg group with 3 setae (fig. 142) 4 



4. Abdominal segments 1-7 each with 18 setae (fig. 148). , Pachygaster Meigen 

 Abdominal segments 1-7 each with 20 setae (fig. 142). Zabrachia Coquillett 



Genus Berkshiria Johnson, 1914 



This genus contains the single species Berkshiria alhistylum, the 

 larva of which has been collected from beneath the bark of deciduous 

 trees only. As Kraft and Cook (1961) have pointed out, it resembles 

 Neopachygaster but can be readily distinguished on the basis of the 

 form of the sternal patch. 



Generic characters.- — As given in key to genera. 



Berkshiria alhistylum Johnson, 1914 



Figure 142 



Description. — Mature larva: length (5.0-7.2 mm) 5.0-5.9 mm, 

 mean 5.3 mm; width (1.6-2.0 mm) 2.0-2.4 mm, mean 2.2 mm. 



Biology — Larvae of B. alhistylum have been collected from under 

 the bark of poplar (Populus deltoid es) and elm (Ulmus pumila). 

 Cook (1953) reported that the larvae have at least 4 instars that 

 apparently do not form distinct size groups. He also mentioned 

 that the pupal period lasted from 8 to 10 days and that the adults 

 did not live for more than 5 days in the laboratory. 



Material examined. — Eight larvae from the Ohio State University 

 collection with the following data: Dec. 5, 1942, under bark of dead 

 poplar. 



Genus Zabrachia Coquillett, 1901 



Of the 11 species listed for this genus by Kraft and Cook (1961), 

 the larvae of only 2 species have been found. Both species were 

 taken from beneath the bark of coniferous trees. 



Generic characters. — As given in key to genera. 



Key to Species of Zabrachia Coquillett 



(after Kraft and Cook, 1961) 



Ventral surface of abdominal segment 6 with 18 large plaques . politum Coquillett 

 Ventral surface of abdominal segment 6 with 16 large plaques. 



pHcatum Kraft and Cook 



