82-t [December, 



TRYPETA BIG-ELOVI.F., n. sp. 

 BY T. D. A. COCKEEELL. 



Trypeta sp., Cldl., Ent. Mo. Mag., Aug., 18S9, xxv, 363 {sine descr.). 

 Trypeta hiyelovice, Ckll., Entom., March, 1890, xxiii, 75 (gall only). 

 Trypeta hiyelovice, Ashuiead, Hymen. >ptera o£ Colorado, Bull. 1, 

 Colorado Biological Assoc, 1890 [pub. May 2-ltb], p. 25 (name 

 only). 



Length, Sj mm. Head pale- lemon-yellow, eyes bright green ; thorax covered 

 with whitish hairs, and having also a few black bristles. Scutellum olive-brown, 

 bare, emitting two long black bristles. Abdomen oval, black or very dark brown 

 above, pale yellow beneath. Legs honey-yellow. Halteres pale lemon-yellow. 

 Wings yellowish at base, otherwise black with hyaline spaces, namely, three on 

 costa ; one, elongate, below apes ; one, <-shaped, lower than that ; three on inferior 

 margin, the interior one being the largest ; and two hyaline spots in the middle 

 of wing. 



var. disrupta. The <-shaped hyaline mark divided into two by the obliteration 

 of its apex. 



Described from fresh specimens, bred May, 1889, from woolly 

 galls on Bigelovia graveolens, Gray, found at West Cliff, Custer Co., 

 Colorado. I also found the galls at Dora, Custer Co., and near Hill- 

 side, Fremont Co., Colo. I offer a description of this apparently 

 new species especially because the gall has already been described under 

 the name T. hiyelovice, and it is therefore very desirable to have means 

 of recognising the fly which produces it. 



The following iusects have also been bred from the Trypetid galls 

 on Biyelovia, collected at West Cliff : — 

 (1). Ceeydomyia bigelovice, Ckll., Ent. Mo. Mag., April, 1890, p. 109. 

 (2). Anthonomus canus. I found a specimen of this weevil in a box in which I had 

 placed some Trypetid Bigelovia galls. No doubt it was bred from one of 

 them, but its connection with T. bigelovice is not yet proved. 

 (3). Torymus sp. 

 (4). Eurytoma bigelovice, Ashmead, Bull. 1, Colo. Biol. Assn., 1890, p. 25. 



Near Ula, Colorado, I found a small greyish Lepidopterous larva 

 with a black head, in a gall of Trypeta hiyelovice, but the imago was 

 not reared. Near West Cliff, on May 2nd, ISOO, I found some galls 

 on Biyelovin dift'ering from those of the present species, being round, 

 harder, scantily woolly, diam. 6 mm. A puparium \vithin was elongate- 

 cylindrical, dark brown, rounded at ends. There is also a third kind 

 of gall on Bigelovia in the same district, but the insect that makes it is 

 unknown. I am indebted to Mr. W. H. Ashmead, Dr. C. V. Riley, 

 and Mr. L. 0. Howard for assistance towards the identification of 

 the insects mentioned. 



3, Fairfax Koad, Bedford Park, 



Chiswick, W. : October 2H//i, 1890. 



