51 



/- 



have been already recommended in our replies to various correspond- 

 ents: 



In tbe event of an invasion of these 

 mites, the lawns about the buildings, and, 

 if practicable, the sides of the buildings, 

 should be sprayed with the kerosene emul- 

 sion. The lower portion of the building, 

 walls, etc., may be treated with pure kero- 

 sene with advantage. These applications 

 should be repeated every day or two, or 

 as often as necessary to destroy or repel 

 the mites. Infested houses may be freed 

 by spraying with benzine, which may be 

 used freely without danger if care be taken 

 that no fire is present, as this substance 

 vaporizes rapidly and is highly inflam- 

 mable. A thorough airing will remove all fig.s.-bryobiapeatensis: Xewiy- 



^ ° hatched larva — g.cat.y enlarged. 



traces of the odor of this substance. (Original.) 



Vo 



DESCRIPTION OF VARIOUS STAGKS. 



Egg. — 0.19™"^ in diameter, spherical, slightly flattened at base; color, vermilion; 

 shining : placed singly or, more commonly, in masses covering bark of trees to a depth 

 of from one to three layers. 



Young Larva. — 0.18 by 0.22'""', nearly circular. Color red (vermilion). Surface 

 irregularly striate. Three pairs legs, all 5-jointed, not exceeding body in length, 

 second and last joints longest ; the first pair of legs slightly exceeding the others in 

 length ; tarsi surrounded vs'ith six knobbed hairs, two at the tip and the other four 

 near the base. Eyes two, situated on a reddish-purple triangular spot a little back 

 of the center and near the edge of the cephaluthorax. Cephalothorax one-third less 

 in size than abdomen. Scale-like appendages of the adult occur on the larva in same 

 number and position, bub are more elongate, being more in the nature of serrate 

 spines ; frontal processes wanting, but in place of them occur two serrate spines pro- 

 jecting forwards. The position of the spines on the body is as follows: Two pr^-ject- 

 ing from the anterior extremity, one in front and one behind eyes; one at anterior 

 angle, two pairs closely placed near lateral margin, three arranged in triangle near 

 posterior margin of abdomen, three pairs on dorsum of abdomen ; making in all 28 

 spines. 



Later Stages. — The full complement of legs, as also the anterior scale-tipped projec- 

 tions, appear after the first or second molt ; the legs in relative length and in length 

 of joints approach those of the adult, but are shorter and stouter; the scales of body 

 also become like those of adult. Little change in color occurs until nearly full size 

 is reached. 



Mr. Garman's species are described as follows : 



Bryobia pratensis, n. s., H. Garman. 



Body oval in outline as seen from above or below ; but little elongated. Outline 

 as seen from side also oval, increasing in depth towards the posterior extremity, 

 where it is abruptly truncated. Strongly convex above, much less so below. Entire 

 surface rugose, with more or less parallel, waved striiv. Stri;p of dorsal surface of ab- 

 domen coarser and more regular than those of the ventral surface and of the cephalo- 

 thorax. 



With scattered, curved, finely denticulate, scale-like appendages attached to the 

 dorsum and at the margins. These scales expand uniformly from their bases to their 



