I 



THE CANADIAN ENTOMOLOGIST, 267 



A NEW DACTYLOPIUS (FAM. COCCID.*:) FROM ARIZONA. 



BY T. D. A. COCKERELL, N. M. AGR. EXP. STA. 



Dactylopius hymenocUce, n. S[). — $ . Black when dry, entirely 

 covered and concealed by the firm snow-white ovisac, forming a rounded 

 mass about 4 mm. diam. These masses are adherent to one another, 

 forming very conspicuous white cottony balls on the plant, having a 

 diameter of from ten to twelve mm. The surface of the ovisac is rough, 

 but not at all ribbed. The female, boiled and flattened under a covei- 

 glass, is oval, about 4 mm. long. After being boiled in caustic soda, 

 soaked in alcohol, and mounted in balsam, the insect is found to exhibit 

 two different pigments : one a pale magenta, the other a dark bluish green. 

 Skin with very numerous small circular glands, and a good many rather 

 large dagger-shaped spines, in the caudal region. Legs and antennae 

 pale brown ; legs fairly stout ; coxa 99. Femur with trochanter 144) 

 tibia 72, tarsus with claw 60 /x ; claw digitules slender, with a very small 

 knob ; claw with a minute denticle on the inner side just before the tip ; 

 antennae 7 -segmented, the segments measuring as follows in /x : — (i) 28. 

 (2)25-30. (3)23-25. (4)23-31. (5)15-19. (6)24-28. (7)59-64. 

 Embryonic larva large. 



Hab. — On Hymenoclea monogyra in the river bottom, about six miles 

 from Tucson, Arizona; collected three years ago by Prof. J. W. Tourney. 

 I learn from Prof Toumey that he had partially described this interesting 

 species; but he has mislaid his MSS., and has no time at present to attend 

 to the matter, so he has asked me to publish a description. 



D. hymenoclece is evidently related to D. filatnentosus, Ckll., by its 7- 

 segmented antennae, its bluish-green pigment, and its manner of collecting 

 in globular masses on the plant. The legs oi filainentosus are larger 

 (coxa 120, femur with trochanter 177, tibia 90, tarsus with claw 75 //) ; 

 and the denticle on the inner side of the claw, instead of being almost 

 at the tip, is about half way between base and tip, and is quite large. 



D. filatnentosus has a large anal ring, with very large bristles upon it, 

 and the region around it, while presenting a good many circular glands, 

 does not have the dagger-shaped spines. 



I will take this opportunity to record that Prof Toumey sent me 

 Lecaniodiaspis rufescens (Ckll.), collected at Tucson on Fotiqiiiera 

 splendens. I now consider this to be a valid species, distinct from 

 yuccce, as many specimens from various localities preserve the distinctive 

 characters. 



