331 



3 there are no alternating slender hairs between the median 6 or 8 

 thorns and the hairs are rather weak when present ; on segment 4 these 

 hairs are not present between the median 4 thorns ; on the other seg- 

 ments, 5 to 7, they are present on the wliole series; segment 8 has 

 about 6 short stout thorns in the transverse series between which, ex- 

 cept in the case of the central pair, there are alternating long hairs; 

 lateral aspect of pupa as shown in Figure 4; apical segment of abdo- 

 men with a parallel pair of stout upwardly and backwardly directed 

 thorns which are broad at base and have each a small subbasal tooth. 



The pupal exuvium from which the above description was drawn 

 is that of a specimen reared from Tiphia sp. collected at Elliott, 111., 

 April 27, 1906, and which emerged July 17, 1906. There are in the 

 collection of this Laboratory a large number of specimens of exuvia of 

 pupai that were obtained at Elliott and Mackinaw, 111., the imagines 

 emerging on various dates between July 17 and August 8. Some 

 which produced imagines of the parasites were collected September 30. 

 This species is a hyperparasite affecting Tiphia species which are para- 

 sitic upon Lachnosterna species. 



The species is generally distributed throughout the state, occurring 

 from the beginning of July till the end of September. Imagines are in 

 the laboratory collection from the following Illinois localities : Algon- 

 quin, Savanna, Havana, Pekin, Urbana, Champaign, Normal, Albion, 

 Carlinville,Clay City, Bridgewater, Williams Mountain, Herod, Grand 

 Tower, Alto Pass, Teheran, and Metropolis. There is also a specimen 

 from Westville, N. J. 



SPARN0P01.IUS FUI.VUS Wiedemann 



Bombylius fulvus, Wiedemann, Dipt. Exot., 1821, p. 172. 



Bombylius I'licrminieri Macqiiart, Dipt. Exot., A^ol. 2, Pt. 1, 1841, p. 103. 



Bomhylius hrevirostris Macquart, 1. e. 



Sparnopolius fulvus (Wiedemann) Loew, Neue Beitr., Vol. 3, 1855, p. 43. 



Pupa. — Length 11-12 mm. Yellowish testaceous, slightly shining. 

 Surface smooth. Head with upper pair of thorns widely separated at 

 base ; lateral pair separated by about as great a distance as the length 

 of the lower thorn, the base of the latter with a slight tubercle on lower 

 surface upon which there are two hairs (PI. LXXXIII, Fig. 7) ; the 

 pair of thorns on median line of lower portion of head of moderate 

 size, directed downward, and rather widely separated basally; the 

 normal 8 cephalic hairs present. Prothoracic spiracle rather small, dis- 

 tinctly elevated, its apex with narrow rugose rim ; mesothorax with 3 

 hairs, 2 above the base of wing sheath and one midway between that 



