59.57.52 
Article II.— DESCRIPTIONS AND RECORDS OF COCCID. 
By T. D. A. CockERELL AND ExizaABetH ROBINSON, 
Trionymus violascens Cockerell. 
Mr. E. Bethel sends abundant material, labelled, “on Agropyron occt- 
dentale (A. smithiz), vacant lots in Denver, Colo., Oct. 5, 1914.” He notes 
that it “is the most common and destructive insect to grasses that we 
have, as it is widely distributed, and very abundant in many places.” At 
Walsenburg, where Mr. Bethel first found this coccid, the grass was only 
half its normal size; he adds that cattle will not eat it when thus affected. 
_Eriococcus costaricensis n. sp. 
Q. Length about 1.75 mm., in a perfectly white sac; body turning bright red 
when boiled in KOH. Tarsus distinctly longer than tibia; claw with denticle on 
inner side near apex (this denticle is also present in E. adenostome, E. cockerelli and 
E. palmer). 
The following measurements are allin microns: antennz 7-jointed, joints (1.) 30, 
(2.) 83, (3.) 50, (4.) 39, (5.) 20, (6.) 20, (7.) 35. Dermal spines about 25 long. Caudal 
lobes large, about 63 long, armed as in EF. cockerelli, their bristles about 175 long. 
Bristles of anal ring about 88 long. Middle femur with trochanter about 160 long. 
Anterior tibia, 88, tarsus (the tarsus in each case measured without claw) 113; middle 
tibia, 100, tarsus 118; hind tibia, 105, tarsus 125. 
Hab.— On twigs of Vaccinium, with much black fungus; Mt. Irazu, Costa Rica, 
11,300 ft., March 15, 1913 (Z. Bethel). 
Differs from E. cockerelli Essig by the longer tarsus, and from L. adeno- 
stome Ehrhorn by the third antennal joint conspicuously longer than the 
last, as well as the larger size. All these insects are very closely related, and 
could be regarded as subspecies of a single widely distributed species, but it 
is probable that they would appear more distinct in life, especially if the 
earlier stages and males were known. The Eriococcus type is extraordi- 
narily conservative, and shows surprisingly little modification in the most 
remote localities, although the various species or races must have been 
isolated for ages. 
E. costaricensis comes from the highest altitude yet known for a Coccid. 
Eriococcus tinsleyi Cockerell. 
Walsenburg, Colorado, on Malvastrum cocconeum, Aug. 16, 1911 CE. 
Bethel). 
105 
