X907.] White-grubs and May-beetles. 475 



were again frequently seen June 12 to 18, 1907, among May-beetles 

 on trees at night, no less than twenty-six specimens being captured. 

 These flies have also been occasionally taken at electric lights, and 

 in various situations by day during different years, from May 20 

 to June 17. 



The puparia of these parasites are dull black, broad ovate, widest 

 at the posterior third. At the. tip is a small shallow excavation en- 

 circled by a rugose ridge, which is elevated latero-dorsally into a 

 pair of short irregular tubercles, the tips of which are about a milli- 

 meter apart. Length 7-8 mm. ; greatest diameter, 4.5-4.8 mm. ; 

 diameter of anterior end, about 3 mm. The adult flies are yellow- 

 brown, three eighths to half an inch long. The head is subtriangular, 

 the thorax globose, the abdomen slender at base, enlarging apically. 

 The wings are three eighths to half an inch long, conspicuously and 

 characteristically marked. The entire anterior margin of the wings 

 has a broad brown border reaching half way across the wing, and 

 having two broad saw-tooth-like extensions attaining the posterior 

 ■margin, one at the middle of the apical half and the other at that 

 of the basal half. The first two abdominal segments are about as 

 long as broad, and connate; the next four, in the female, are very 

 short, followed by the genital segment, which is very large, shining, 

 directed downwards and curved slightly forwards. 



The male abdomen is similarly shaped : the two basal segments 

 are followed by two more about twice as long as the corresponding 

 ones in the female ; the next segment is a little longer than broad, 

 vertically directed, bearing the genital segment, which is directed 

 somewhat anteriorly. The eyes are larger in the female than in 

 the male. 



Other Dipterous Parasites. — In 1905 a May-beetle of the species 

 Lachnosterna crenulata found near Urbana July 15, laid three eggs, 

 and died about the 29th of July. On August 5 an adult tachinid 

 emerged from the body which Mr. Tyler Townsend, of the U. S. 

 National Museum, regards as a new species — Viviana. Two dip- 

 terous larvae were found June 27, 1906, in a May-beetle taken alive 

 May 31. July 10 these larvas had formed puparia, and adult tachinid 

 flies emerged May 17 and 18 of the following year. These are 

 slightly larger than a house-fly, with black subquadrate thorax, the 

 anterior angles each with a triangular red spot. The f)uparium is 

 very dark red, almost black, subcylindrical, with rounded ends. 

 Length, 7 mm. ; width, 3 mm. It is smoothly rounded behind, with 

 a pair of low tubercles placed close together. The species has not 

 been determined. 



