226 



Tetranychus 6-maculatus n. sp. — Length of the full-grown specimens 0. 3 mm . Gen- 

 eral color, pale greenish-yellow, marked on the abdomen with six or less small dusky- 

 spots. General shape oval, somewhat broadest in front of the eyes ; laterally slightly 



constricted just opposite the eyes and at about 

 the middle of the body, at which latter constric- 

 tion the body is divided by a more or less dis- 

 tinct suture into two parts. There is often, also 

 a distinct, though small tail-like projection at the 

 end of the body. Anterior projection of cepha- 

 lothorax rather short, some what conical, its apex 

 rounded. Terminal joint of legs longest. Eyes, 

 two each side, the anterior one of each pair being 

 blood-red, this pigment extending some distance 

 into the body, giving the appeararice of two red 

 eyes on each si< e ; the posterior eyes are colorless 

 and transparent. The spots of the abdomen are 

 arranged in two subdorsal rows, of three spots 

 to each row; they are rounded and quite con- 

 stant, especially in the smaller and more numer- 

 ous specimens, though somewhat variable in the 

 larger or full-grown mites. 



In the mature specimens the anterior spots, 

 which are arranged close to the dividing suture, 

 are often composed of a collection of eight to 

 twelve, larger or smaller, more or less circular, 

 quite deep black spots, while in others all the 

 spots are single, and with one or the other of the 

 median pair wanting. In the smallest speci- 

 mens these spots are either wanting or only the 

 an terior or posterior pairs are present, the last pair in this case being generally largest 

 and very distinct. The distribution of the hairs of the body is as follows: Two short, 

 slender hairs medially at anterior margin, directed forward, crossing each other near 

 their tips; each side of these, also close to the margin, at about equal distances from 

 each other and the lateral margin is a pair of transparent, circular pores, resembling 

 those which usually give rise to a bristle. Iu front of the eyes and removed slightly 

 toward the middle is, on each side, a row of rather long and stout bristles, the an- 

 terior pair being directed outward and slightly toward the head, and projecting 

 beyond the lateral margin ; the median pair are directed forward and cross each other 

 near their tips. The third pair are longest, situated a little in front of the eyes and 

 directed backward. Besides these stout bristles there is another smaller and slender 

 hair not far from the lateral margin behind the eyes, and another at the margin in 

 front of the eyes. The abdomen is provided on each side with a subdorsal row of 

 three very long bristles, a more slender lateral row, four long dorsal bristles surround- 

 ing the end, and four ventral terminal bristles, of which the median pair is smallest. 

 The eggs are 0.11 mra in diameter, globular, either colorless and transparent or very 

 pale greenish-yellow, and are loosely attached to the web. 



Fig. 44 — Tetranychus 6-maculatus : a, rfom 

 above — enlarged; b, tarsus; c, rostrum 

 and palpus— still more enlarged; d, tip 

 of palpus— still more enlarged (original). 



