HELEOMYZID FLIES NORTH OF MEXICO—GILL 579 
Surstylus of male not reduced, wider than the distal portion of the epiphallic 
PROCES Ene Pe he ee ces eds Nous Gee nko te et (epectabilia' (Loew) 
Amoebaleria defessa (Osten=Sacken) 
FIGuRE 74 
Blepharoptera defessa Osten-Sacken, 1877, p. 168. 
Leria pubescens (Loew), Aldrich and Darlington, 1908, p. 80. 
Leria defessa (Osten-Sacken), Aldrich and Darlington, 1908, p. 81. 
Amoebaleria defessa (Osten-Sacken), Czerny, 1924, p. 132. 
The presence of setae or hairs in the posterior half of the mesopleuron 
will distinguish Amoebaleria defessa (Osten-Sacken) and A. sackeni 
Garrett from other species of Amoebaleria. These two species can be 
distinguished from each other only by the structure of the male 
terminalia. 
MALE AND FEMALE.—Ocellar triangle, vertex, and back of head 
grayish pollinose; front reddish orange; antennae yellow to brownish; 
remainder of head yellow; anterior fronto-orbital bristle about \% to %4 
the height of the posterior bristle; about 2 to 3 irregular rows of buccal 
setae. 
Thorax grayish brown; brown spots at bases of dorsocentrals and 
sometimes the other bristles of the mesonotum; scutellum may be 
yellowed; propleural bristle strong; mesopleuron with several setae 
in anterior corner and a group of setae in the lower hind portion; 
1 strong sternopleural bristle and setae down the middle to the 
longer hairs between the coxae; legs yellowish brown, darker distally; 
wings with brownish tinge, but no distinct infuscations; abdomen 
grayish brown; surstylus of male straight and fingerlike distally; 
epiphallic process of male gradually expanded towards the base, when 
viewed from below. 
Lenotu.—4.5-7.0 mm. 
DistriBuTiIon.—Alaska, Missouri, Tennessee, Kentucky, Indiana, 
West Virginia, Virginia, Pennsylvania; April-November. 
Brotocy.—A female of A. defessa (Osten-Sacken) or A. sacken? 
Garrett was collected “at sap in woods’ (specimen in Carnegie 
Museum). Another such female was labelled ‘‘at maple sap” (speci- 
men in U.S. National Museum). Other females of one or both of 
these species were collected in caves as much as 600 yards from the 
mouth (specimens in U.S. National Museum). Series which have 
included males, and could therefore be determined as A. defessa 
(Osten-Sacken), have been collected on cave walls as deep as 150 
yards from the mouth. Both A. defessa (Osten-Sacken) and A. 
sackeni Garrett have proved to be very common in collections made 
in caves of the eastern United States. 
