and Warble Magr/ot. 
491 
secure the date of the first appearance of the warble in its open 
condition, which took place (generally) from about the 14th to 
the 25th of February. The first advance on the condition of a 
mere hair-like streak through the hide was found in specimens 
cut from the hide of a joung bull, and sent me by Mr. John 
Dalton, of Wigton, on Jan. 27. In these there was the first 
appearance of the warble as a perforated sweUinff, with the 
masro-ot of a clearlv distinguishable size within. The channel 
through the hide was still very small, the opening on the out- 
side being about as large as the prick of a common darning - 
needle, and below, though larger, scarcely the sixteenth of an 
inch across. 
This perforation, or maggot gallery, was somewhat cone- 
shaped, with smooth, white, shiruj icalls. These conditions are 
important to be observed, as they show that the passage could 
not be formed by ulceration, which would not have given clean 
smooth walls to the hole. 
The maggots in this state of warble differed in size ; the 
smallest I measured was about half an inch long, and nearly 
worm-like in shape ; rounded at the mouth-end, bluntly pointed 
at the tail, white, transparent, and marked across what may be 
called its back, with sixteen short bands of very minute black 
or dark grey prickles, placed, for the most part, in alternate 
very narrow and broader stripes. There was some variety in 
the shape of the maggots, according to whether they were alive 
and distended with fluid, or other circumstances ; but those I 
had at this stage were worm-like or spindle-shaped, and in the 
youngest condition the maggot was furnished with a pair of 
strong mouth-forks (Fig. 4), which are a most important item 
in its structure, and, as far as I am aware, have not previously 
been noticed in the young maggot of this species of Hypoderma 
or Warble Fly. 
The apparatus may be described as consisting of a pair of 
crescent-shaped forks, placed nearly side by side, at the ex- 
2 K 2 
