118 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



sisting of two at first incision, second of eight at second incision, third of five to eight 

 caudad of fourth spine; median and lateral basal thickenings prominent; apical ven- 

 tral chitinization strongly developed, brown; ventral longitudinal ridges fairly dis- 

 tinct. (See PL XVIII, fig. 3.) 



Winged male (PL XIX). — -Appears in June; at least no record of its earlier appear- 

 ance can be found in literature, and the writer reared no males previous to this date. 

 Head 0.06 mm. long, 0.107 mm. wide, about the same color as the thorax, nearly 

 rectangular in shape, broadening somewhat at base. Eyes brownish in color, located 

 on the side of head near the front. Ocelli two in number, on the upper part of the epi- 

 cranium, and lighter in color than the compound eyes. Mouth parts apparently 

 absent. Antennx about same color as thorax, bearing 10 segments, the basal one 

 being short and nearly globose, others nearly uniform in size, with spines or hairs 

 which are longer on the apical segment and absent on the basal. Length of antennal 

 segments: (1) 0.016 mm., (2) 0.016 mm., (3) 0.049 mm., (4) 0.049 mm., (5) 0.05 mm., 

 (6) 0.066 mm., (7) 0.049 mm., (8) 0.032 mm., (9) 0.041 mm., (10) 0.04 mm. Width 

 of segments: (1) 0.024 mm., (2) 0.016 mm., (3) 0.014 mm., (4) 0.016 mm., (5) 0.018 

 mm., (6) 0.016 mm., (7) 0.016 mm., (8) 0.018 mm., (9) 0.018 mm., (10) 0.012 mm. 

 Abdomen eight-segmented, having at the caudal end a long spikelike appendage, 

 termed style or genital spike (see PL XIX, fig. 2), about 0.215 mm. long and 0.033 

 mm. wide at base, tapering to a sharp point grooved below, forming a sheath for the 

 penis, this sheath bearing four hairs or bristles at base, two on the dorsum and two 

 stronger, ventrad . Thorax, general color pale clay-yellow, with edge of the thoracic 

 shield darker, approaching cadmium-yellow; slightly longer than broad, crossed at the 

 central part of dorsum by a heavy pale-brown band about one-half the width of the 

 thorax at point of intersection; cephalic and caudal margins slightly concave, with 

 blunt-shaped ends. Wings, length 0.56 mm., width 0.249 mm., covered with nu- 

 merous spines, colorless, very narrow at base, bearing two main veins, the costal pre- 

 senting caudal serrations (see PL XIX, fig. 4); located on the lateral margin of the 

 metathorax are the "halteres," or "balancers," which hook into the lobes at the base 

 of the wings, giving them additional strength. Legs about the same color as body; 

 coxa very broad, stout, wider at base; trochanter nearly rectangular, stout, not so 

 broad as coxa; femur narrower at proximal extremity, growing broader distad; tibia 

 slender, with hairs near distal end; tarsus rather broad at base, gradually tapering 

 toward claw, also with many hairs at distal end; claw broad at base and curved inward. 

 Measurements of left posterior leg, as follows: 





Width. 



Length. 





Width. 



Length. 



Coxa 



Mm. 

 0.03 

 .011 

 .03 



Mm. 

 0.046 

 .01 

 .092 



Tibia 



Mm. 

 0.023 

 .019 

 .003 



Mm. 

 0.08 



Trochanter 



Tarsus 



.061 



Femur . . 



Claw 



.007 









PARASITES. 

 SPECIES PREVIOUSLY RECORDED. 



In one publication x Miss Mary E. Murtfeldt reports a species of 

 Centrodora as being found parasitizing the grape scale. 



In another publication 2 Miss Murtfeldt mentions that the grape 

 scale is preyed upon by mites belonging to the genus Tyroglyphus. 



In 1888 and 1889 Miss Murtfeldt sent in a few specimens of a par- 

 asite which proved to belong to the Chalcididse, subfamily AphelininaB, 



i 36th Ann. Rept. Hort. Soc. Mo., pp. 118-119, 1893. 



2 Insect Life, vol. 7, p. 5, 1894. 



