452 ENTOMOLOGICAL NEWS [Dec., '13 



scarcely perceptible, ovoid tympanum, corresponding portion 

 of cephalic fare not swollen. Caudal femora greatly dilated; 

 caudal tibise with dorsal margins each armed with three pairs 

 of extremely long, widely spaced, unmodified, mobile spines* 

 placed in a double row and armed distad with three external 

 and two internal spurs. The ventro-internal spur, always 

 present in Nemobius, is missing in the present genus. Caudal 

 metatarsi non-sulcate and unarmed dorsad. 



Remarks. With the exception of the characters given for 

 the female', the original description of-//, alleni, with which is 

 also given valuable data on the capture and habits of the in- 

 sect, is excellent. A study of the North American species of 

 the genus Nemobius has prompted the examination and study 

 of the typical material of this insect. 



The peculiar reduction of the tegrriina in the male of this 

 insect is shown in the figure here given. 



'Distribution. This genus is known only from the mangrove 

 swamps of Mbraine Cay in the northern Bahamas. 



A New Parasite of the House Fly (Acarina, 



Gamasoidea). 



By H. E. EWING, Corvallis, Oregon. 



(Plate XVII.) 



The great interest which of recent years has attached to the 

 house fly because of the discovery of its role as a disease-car- 

 rier has caused economic entomologists to consider all possible 

 means which may be employed for its control. As in the case 

 of most insect pests, natural enemies have received much at- 

 tention in this regard. So far, although no one species has 

 been found that offers any serious check to the increase of the 

 house fly, many have been recorded as preying upon it. Dr. 



* These spines are evenly rounded and covered with hairs, but 

 have, like in Ncmobivs. their apices uncinate, smooth, sharp and 

 hard. 



