25 



"The adult male is a trifle over 3 mm. in length, and has an average wing expanse of 7.5 

 mm. The general color is orange red. The head above is triangular in shape, with the 

 apex blunt and projecting forward between the bases of the antenna;. The eyes are placed 

 at the other apices of the triangle, and are lai-ge, prominent, and furnished witli well 

 marked facets. There are no mouth parts, but on the under side of the head is a stellate 

 black spot with five prongs, one projecting forward on the conical lengthening of the head, 

 one on each side to a point just anterior to the eyes and just posterior to the bases of the 

 antenna;, and the remaining two extending laterally backward behind the eyes. The 

 antennie are light brown in color, and are composed of ten joints. Joint one is stout, 

 almost globular, and nearly as broad as long; joint two is half as broad as one, and is 

 somewhat longer; joint three is nearly twice as long as one, and slightlj^ narrower than 

 two; joints four, five, six, seven, eight, nine, and ten are all of about the same length as 

 joint three, and grow successively a little more slender; each joint, except joint one, is 

 furnished with two whorls of long light-brown hairs, one near base and the other near 

 tip; each joint is somewhat constricted between its two whorls, joint two less so than the 

 others. There are no visible ocelli. The pronotum has two wavy subdorsal longitudinal 

 black lines, and the mesonotum is nearly all black, except aiji oval patch on the scutum. 

 The metanotal spiracles are black, and there is a transverse crescent-shaped black mark, 

 with a short median backward prolongation. The mesosternum is black. The legs are 

 also nearl.y black and quite thickly furnished with short hairs. The wings are smoky 

 black, and are covered with rounded wavy elevations, making a reticvdate surface, a cross 

 section of which would appear crenulate. The costa is thick and 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 median) is given off at about one sixth the length of the wing, 

 and extends out into the disk a little more than one half the wing length. There are, in 

 addition, two white lines, one extending out from the fork of the subcostal and the median 

 nearly straight to the tip of the wing, and one from the base in a gradual curve to a point 

 some distance below the tip. Near the base of the wing below is a snudl ear-shaped pro- 

 longation, folded slightly on itself, making a sort of pocket. The halteres are foliate, and 

 furnished at tips with two hooks, which fit 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 tip four long hairs and a few shorter ones. 

 "When the insect is at rest the wings lie flat upon the back." 



Rate of Growth of the Different Stages. 



The rate of growth of theinsect necessarily depends so much upon surrounding condi- 

 tions, and especially on theTmean temperature, that it is difficult to make any definite 

 statements as to tiine elapsing between molts or that required for other periods of the 

 insect's growth. No facts have hitherto been published which bear upon this point. Mr. 

 Coquillett's observations show that individuals hatched from eggs on the fourth of March 

 cast the first skin on the twenty-third of April, and underwent the last molt on the twenty- 

 third of May.— Mr. Koebele also reports a case which bears upon this point, and which is 

 interesting as occurring later in the season. He placed four newly hatched larvae on a 

 healthy young orange tree, out of doors, August fifth. On September twenty-sixth two 

 of them passed through the first molt. October tenth one more molted, and on October 



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