308 



dows of the Natural History Building of the University of Illinois, 

 especially in the basement on windows close to the outer doors. Only 

 three specimens of the species were taken in the act of biting on the 

 dates that collections were made at White Heath, two of these being 

 taken at the Sangamon River May 30, and the other at the railroad 

 station in the town over a mile from the river. It appears from the 

 rate of occurrence of this species in our collections that sanguisiujus is 

 more common in towns than giittipennis or varipcnnis. 



CuLicomES h^:matopotus Malloch 



This species occurred along with giittipennis but in smaller num- 

 bers. It was taken biting on May 6, 9, and 30, and June 6. Some 

 specimens were taken on windows of the Natural History Building 

 also. Its biting habits are similar to those of guttipcnnis. The bite of 

 both is less severe than that of varipennis. 



Culicoide;s biguttatus Coquillett 



Ceratopogon biguttatus Coquillett, Proc. U. S. Nat. Miis., Vol. 23, p. 604. 



This species is an addition to the Illinois list, the only specimens I 

 had when I wrote my previous paper being from Virginia. 



As an aid to the identification of the species it is necessary to indi- 

 cate that in my key to the Illinois species* biguttatus will run down to 

 No. 6. To include it, it is necessary to change the wording to read as 

 follows : 



6. Spots on wings indistinct; mcsonotuni without well-defined mark- 

 ings 6a 



— Spots on wing I'ounded, clearly defined; mcsonotnin with well-de- 

 fined brown markings 7 



6a. Wings with only 2 clear spots, one over cross vein and the other at 

 apex of third higuttatus. 



- — Wings with several ill-defined clear marks in the posterior and anal 

 cells along wing margin in addition to those over cross vein and at 

 apex of third sanguisugus. 



Coquillett originally described biguttatus from specimens obtained 

 in the District of Columbia. In Illinois the species occurred on the 

 same dates as guttipcnnis and at the same place. The largest number 

 taken biting on any one day was thirteen on May 15. This species 

 attaches itself more firmly to the skin than does guttipcnnis and can be 

 taken much more easily by inverting the cyanide vial over it when in 



*Bull. 111. State Lab. Nat. Hist., Vol. 10, Art. 6, p. 296. 



