160 THE CANADIAN ENTOMOLOGIST. 



perceptible. I have found numbers of the scales of Aspidiotus citricola 

 with a hole perforated in the top by the ApJielinus, into which it crawls 

 and lays its eggs ; the larvae on hatching feed upon the eggs of the Scale 

 Insect. Glover also mentions having found it. 



Leaf- Scaled Coccus. 



Lecanium phytlococcus, n. sp. — Oval, convex, cinereous (entirely coated 

 with a powder-like substance). Antenna; eight-jointed, inserted below and 

 under the eyes ; abdomen composed of eight or more segments ; surround- 

 ing the outer edge is a series of leaf like scales extending to the head; legs 

 six. Length from .03 to .14 of an inch. Some are very large and nearly 

 round, which I believe are the females ready to lay their eggs. The eggs 

 are laid under a cotton-like substance and are elliptical, of a pale yellow 

 color ; about .02 of an inch in length. It is found in the new shoots and 

 terminal branches. 



My attention has been drawn to a strange insect by Rev. T. W. Moore, 

 which he supposes is the cause of the Orange rust. It may be termed the 

 Oil-eating Mite of the Orange, belonging to the genus Typhlodromus, and 

 is probably the first species of this genus discovered in America. 



Typhlodrotmis oiliioorus, n. sp. — Whitish, flesh color, elongate, cylindri- 

 cal, gradually increasing in size until near the head it becomes twice as 

 thick as at tail ; abdomen apparently consisting of numerous very thin 

 segments ; at the extremity is a bifid appendage that evidently assists in 

 clinging to the Orange; just above it protrude two caudal filaments ; head 

 almost entirely hidden in thorax ; beak short and black ; legs four, rather 

 stout, with one claw and two tarsal hairs. It is too small to measure with 

 my instrument, so must wait until I can get a micrometer to ascertain its 

 length. 



They attach themselves to the oil cells; as the oil exudes the chemical 

 action of the atmosphere causes it to oxidize, and the result is a hard 

 rusty skin. They all fall off and disappear half an hour after the fruit has 

 been picked ; hence the reason why microscopists could never detect any 

 insect, and as a dernier resort, attributed the rust to a fungoid. Thus the 

 long-vexed question of what causes the Orange rust is solved, and proves 

 to be not a fungoid, as many suppose, but an infinitesimal creature that 

 could never have been discovered except with the aid of a microscope. 



