20 PROC. ENT. SOC. WASH., VOL. 23, NO. 1, JAN., 1921 



M. fasciculensis Herbert. 1 

 HERBERT, F. B. In Proc. Ent. Soc. Wash., XXI, 7, p. 157. (Oct., 1919.) 



This species was recently described from California, occurring 

 within the fascicles of three-leaved pines. The antennae of the 

 adult female bear pairs of heavy spines on segments 5 to 9. The 

 apodous larva is oval in outline with all of the spiracles borne at 

 an acute angle to its derm. This species seems to differ from 

 the other two in that it has two larval stages instead of one 

 preceding the apodous form, both of which are similar except 

 for size. In the first larval stage the bases of the antennae are 

 approximate. The antennae were considered to be 7-segmented 

 in the original description, but comparison with the other species 

 indicates that the last segment is in reality a nipple-like process 

 occurring on the 6th. However, it is merely a matter of opinion 

 as a slight lightening of the integument at the base of the former 

 might be interpreted by some as indicating a 7th segment. 



M. acalyptus, new species. 



Adult female. 2 to 3 mm. long and .8 to 1.3 mm. broad, elongate oval in out- 

 line, somewhat narrowed anteriorly. (Plate III G.) Derm rough or crinkled. 

 Antennae rather faintly transversely striated (except 1st and 2d segments), 

 9-segmented, bases approximate. 1st segment large, slightly longer than broad, 

 2d nearly as long and broad, remaining segments becoming successively more 

 slender, each being widest near outer end. Each segment bearing 3 or more 

 slender setae, segments 6 to 9 each also bearing 2 heavier spines. Legs moder- 

 ately large, transversely striated, trochanter bearing 1 long slender seta, the 

 femur, tibia and tarsus each bearing a number of small setae, particularly on 

 inner margin. Tarsus bearing 2 hair-like digitules and the tarsal claw 2 knobbed 

 digitules. Eyes present, mouthparts usually present. Tracheal system con- 

 sisting of one main trachea paralleling the margin of abdomen, each spiracle 

 being connected to it by a single smaller trachea; a number of auxiliaries also 

 extending from the latter toward the center and appendages of body. (PI. Ill G.) 

 Dorsum of abdomen bearing transverse rows of large, simple, circular pores, both 

 dorsum and venter bearing internal ducts, which viewed from above have ap- 

 pearance of 8-shaped pores. Small setae present on both dorsum and venter. 

 Anal ring not discernible. 



Second stage or apodous larva. Body elongate oval in outline, about 1.5 mm. 

 long and y as wide when full grown; in life of a brownish black color. (PI. Ill F.) 

 Without eyes, legs or antennae. Spiracles large and conspicuous, each sur- 

 rounded by a number (3 to 10) of small ducts and set at inner end of a rather 

 short tube, its outer end appearing as a dark chitinized circle. (PL III H.) All 

 perpendicular to derm, the latter somewhat chitinized. Anal tube absent, anal 

 ring not discernible. 



: This species has been made the type of the new genus Americoccus by 

 MacGillivary, "The Coccidae," Jan., 1921, based on the described differences 

 in the antennae. Editor. 



