THE CANADIAIJ ilNTOMOLOGIST. 3^ 



CANADIAN COCCID.^. 



I. THE SPECIES OF CHIONASPIS WHICH INFEST TREES OF THE TRIBE 



BETULE/E. 

 BY T. D. A. COCKERELL, LAS CRUCES, N^iW MEXICO. 



In 1869 Signoret described a species from Switzerland as Chioiiaspis 

 alni. It was found on the bark of the alder (Alnus communis). This 

 species has never been seen in America, but in 1883 Comstock 

 announced a form from alder and Viburnum as Chionaspis Lititneri. 

 Since the latter date our knowledge of the matter seems to have 

 remained without additions. Mr. James Fletcher has just sent me 

 a Chionaspis plentifully infesting the bark of Betula papyrifera, 

 from Charlottetown, Prince Edward Island, about 46° N. Lat. I 

 examined this with interest, owing to the locality and the host plant, 

 and on comparing it with Comstock's account of C. Lintneri, I have 

 no doubt that it is the same. 



The following description was made from the Charlottetown 

 specimens : — 



? scale white, with the exuviae rather small, orange-brown. Scale 

 very broadly pyriform in outline, some nearly circular without the 

 projection on which are the exuviae. Length of scale about 2 mm. 

 ? (soaked, not boiled, in liquor potassse) pale lemon-yellow. Mouth 

 parts large. Ventral grouped glands well-developed, caudolaterals 31, 

 cephalolaterals 38, median group with 18 orifices. A group of nine 

 to fifteen oval dorsal pores situated nearly opposite the lateral 

 groups of ventral glands. Bands of dorsal oval gland-orifices 

 very distinct. The usual sac-like bodies between the lobes. Anal 

 orifice between the cephalolateral groups of glands. 

 Median lobes large, rounded at their ends, but not truncate; their 

 two sides, if continued to a point, would meet at a little less 

 than a right angle. Lobes touching at base, thence widely diverg- 

 ing at about a right angle; not distinctly notched. 

 Second lobes shorter, rounded, with a small appendage or lobule 

 placed cephalad. 



Third lobes rounded, low, forming less than a hemisphere, with 

 a small lobule placed caudad. 



Margin beyond the lobes irregularly crenate, slightly serrate. 

 Spine-like plates as in allied species, two between first and second 



