Me CANADIAN ENTOMOLOGIST. 35 



II. PRELIMINARY NOTE ON THE SPECIES OF LECANIUM FOUND ON OAK IN 



NORTH AMERICA, WITH ESPECIAL REFERENCE TO ONE 



ON QUERCUS RUBRA. 



Some time ago Mr. James Fletcher sent me specimens of a 



Lecanium fomid at Jubilee Point, Rice Lake, Canada, on Quercns 



rubra. This was handed to Mr. J. Bennett for examination, and 



was found by him to present the following characters :— 



Scale, 4 mm. long, 2>^ wide, 2 high. Antennae 7-jointed, formula 



3 (2 i) 7 5 4 6. 7 was almost as long as 2. l^arsus, 2J length of 



tibia ; claw short and not very sharp. 



There are four species of Lecanium known from oaks in North 



America, the characters of which, according to Signoret, are as 



follows (excluding non-essential details) : — 



Z. antennatum. Sign. — Scale, 5 mm. long, zYz wide, 3 high. 

 Antenna 7-jointed, 3 very long, 7 longer than 4, 5 or 6, which 

 are short. Tarsus a little longer than tibia, claw stout Dis- 

 tinguished from quercitronis by its more elongate form. 



Z. quercitronis. Fitch.— Scale, 3 to- 5 mm. long, 3 to 4 wide, hemis- 

 pherical, somewhat elongate in lateral profile. Antennae 7-;ointed, 

 3 and 4 longest, nearly equal, 5 and 6 shortest, 7 as long as 4. 

 Tibia longer than tarsus ; claw very small. On black oak. 



Z. quercifex, Fitch.— Scale, 7 mm. long, 4 wide, 4 high- Antennae 

 7-jointed, 3 and 4 equal, 5 and 6 equal and shortest, 7 as long 

 as 5 + 6. Tarsus as long as tibia. On white oak. 



Z. quercus (Linne?), Sign.— Scale, 7 mm. long, 2>% wide, z^ high. 

 Antennas not seen by Signoret. Tarsus not quite so long as 

 tibia. More rugose than quercifex, but less so than aiitennaticm. 

 This can hardly be the true Linnean insect. 

 In Europe are found on oaks : 



Z. emerici, Planch.— On the "evergreen oaks" in South Europe. 



Z. fuscum, Gmel.— On Qiiercus robur ; scale, 6 mm. diam.; antennas 

 6-jointed, 3 much longer than 4. See Douglas, Ent. Mo. Mag., 

 Oct., 1887, p. 98. 



Z. ciliatum, Dougl.— In England. See Ent. Mo. Mag., 1891, p. 67. 



? Z. quercus, Linn.— On Qjiercus robur. See Douglas, Ent. Mo. 

 Mag., Oct., 1887, p. 99. These four names appear to represent 

 only three recognizable species. 



