208 
mentioned by Dr. Chapin in the first report of the Board of State Horti- 
cultural Commissioners, Sacramento, 1882, p. 68. He found the male 
n numbers during a period of two weeks from September 25, 1881, 
but did not observe it in 1882. It is also mentioned by Matthew Cooke 
in his * Injurious Insects," &e., 1883. , and a roug é 
characteristic figure is given at Fig. 146, Plate s few its of 
description are: * a nech, winged ; colour, thorax and body d rk 
“ extending fr Tod ae each joint ; wings, brown, ir iridescent,” The following 
detailed description is drawn up from numerous specimens, both mounted 
and livi 
“ The o adul male is a trifle over 3?" in length, and has an average 
wing expans of 7:5"", The general colour is orange red. The head 
above is Biaigalsr ] in shape, with the apex blunt and abge forward 
between the bases of the antennw. The eyes are placed at the other 
of the head is a stellate black spot with five prongs, one projectiag 
forward on the i lengthening of the head, one on each side to a 
point just yu i e eyes and just posterior to the bases of the 
antennz, and the ning two extending laterally rui behind 
= eyes, The bcm are light brown in colour, and ar 
n joints. Joint 1 is stout, almost globular, and uy as i brand as 
long: een 2 is half as broad as 1 and is somewhat longer ; J 3 is 
— (€ twice as long as 1 and slightly narrower than 2; join 5, 6, 
7, 8, 9 La 10 are all of about the same length as joint 3, E grow 
successively a little more slender ; each joint, except joint 1, is furnished 
oe of long light-brown hairs, one near base and the other 
ach joint is somewhat constricted between its two whorls, joint 
2 less so diem the others. There are no visible ocelli. The p 
has two wavy subdorsal longitudinal black lines, and the mesonotum is 
nearly all black, except an oval patch on the scutum, "The metanotal 
spiracles are black, and there is a pete hes cuis car black mark, 
with a short medium backward prolongation. The mesosternum is 
black. The legs are also nearly black and quite mms furnished with 
short hairs. The wings are smoky black, and are covered with rounded 
wavy elevations, making a reticulate surface, a ates: section of which 
would appear crenulate. The costa is thick = brown above the sub- 
. costal vein, which reaches costa at a trifle more than four-fifths the 
length of the wing. ‘The only other vein (the Medis) is given off at 
about one sixth the length M" the wing, and extends out into the dise 
a little more than one half the wing length. There are, in addition, 
iwo white lines, one extending out from the fork of the subcostal and 
the median nearly straight to the tip of the wing, and one a the pæ 
in a gradual curve to a point some distance below the tip 
of the wing below is a small e "eee eccle folded ady 
on itself, making a sort of pocket. e halteres are foliate, and fur- 
nished at tip with two hooks, which at into the folded projection at base 
of wings. The abdomen is slightly hairy, with the joints well marked, 
and is furnished at tip with two strong projections, each of which bears 
at aut four long hairs and a few shorter ones. When the insect is at rest 
e wings lie flat upon the back.” 
Bari OF GROWTH OF THE DIFFERENT STAGES, 
Eis rate of growth of the insect necessarily depends so much upon 
urrounding conditions, and especially on the mean temperature, that 
