%\)t Canadian toomologbt. 



VOL. XIV. LONDON, ONT., APRIL, 1882. No. 4 



NOTES ON PEMPHICtUS TESSELATA, Fitch. 



BY HERBERT OSBORN», AMES, IOWA. 



SYNONOMY. 



Chermes alni Kalm. Travels into North America, English translation, 



vol. I, p. 154 ; p. 121, 2nd ed. 

 Eriosoma tesselata Fitch. 4th Report State Cab. Nat. Hist., N, Y. 

 Erioso?tia tesselata Glover. Ag. Rept., 1876, p. 39. 

 Eriosoma tesselata (or imbricata) Glover, unpublished plates Homoptera 



iii., fig. 19. 

 Schizoneura tesselata Thomas, 8th Report Insects of Illinois, p. 139. 



Apparently the first record of this insect is given by Kalm., as cited 

 above, where he says under date of Oct. 3rd, 1748 : " I saw to-day the 

 Chennes of the Alder ( Chermes alni) in great abundance on the branches 

 of that tree, which for that reason looks quite white, and at a distance 

 appears as it were covered with mold." This reference, in all probability, 

 is to P. tesselata, and the reference to the European species, Chermes altii 

 L., a mistake, since there are no later records of the European species 

 being found here, and this one is specifically distinct from the one 

 described by Linnaeus. 



Dr. Fitch describes the apterous female and states that he bad searched 

 in vain for winged individuals. His specimens were from Almis rubra. 

 Mr. Glover states that it was found upon Birch in Maryland. In his 

 unpublished plates he figures the same, referring to it as tesselata or 

 imbricata. 



The newly-born larva is pale brown. The antennae are 4-jointed, the 

 first joint short, second one-half longer, third and terminal nearly equal 

 and each equalling the first and second together. The dorsal portion of 

 the body is covered with slight elevations which mark the position of the 

 wax-secreting glands. They are arranged in rows, there being three rows 

 on each side in the abdominal segments, except the terminal, which has 



