THE CANADIAN ENTOMOLOGIST. 213 



foramen. Head horizontal, small, flat, a little convex above, obovate or 

 more or less quadrangular ; the Y-shaped suture, so common in Termitina, 

 Psocina, etc., on the upper side is entirely wanting ; the eyes are always 

 in the front corner, whereas in the other families they are placed in the 

 middle of the sides or in the hind corner of the head. The eyes of the 

 winged forms are large, prominent, reniform, the facets globose as in 

 aggregate eyes ; the eyes of the wingless forms are smaller, not prominent, 

 and the facets flattened as in the composite eyes ; therefore the head of 

 wingless forms looks different, and is more ovoid ; ocelli are wanting, but 

 some species show a very small impressed line or groove, which calls to 

 mind the obliterate middle ocellus of Blatta, The antennae are as long as 

 the body (Olyntha) or shorter, reaching the end of the metathorax or only 

 the prothorax ; the antennae of the wingless forms are always shorter ; they 

 (antennae) are inserted in a little socket in the anterior excision of the 

 eyes ; 15 to 32 articulated, but so fragile that it is difficult to find a speci- 

 men with the same number of joints on both antennae ; the basal joint is 

 always somewhat stouter than the others, cylindrical ; 2nd joint always 

 very short, annular, 3rd joint always about as long as the ist, and com- 

 monly followed by three shorter joints ; all the following are longer, thick- 

 ened toward the tip, or pear-shaped ; the last one more or less ovoid. 

 The epistoma is short, broad and united with the labrum by a membran- 

 ous rhinarium ; the labrum is large, nearly orbicular, cut off" at the base ; 

 or it is more quadrangular, broader than long, or shorter, largely rounded 

 in front. The mouth parts, at least the palpi, exceed a little the labrum j 

 mandibles strong, horny, with two to three teeth on tip ; maxilla narrow 

 with two teeth on tip ; outer lobe narrow ; palpi longer, strong, 5-jointed 

 (4-jointed in Termitina and Psocina), the three basal ones short, equal ; 

 the last joint much longer, ovoid ; 4th joint always shorter than the 5th, 

 but sometimes about as long as the 3rd. Labium bilobed, large, some- 

 times (I have not material enough to decide this positively) with two very 

 small pointed lobes between them. They are mentioned by Burmeister, 1. c. 

 769, and are to be seen in two of the species in Westwood's figures. On 

 the basis of the upper side of the labium is a long middle slit (as in 

 Psocina), the opening of the spinning glands. It is figured by Savigny, 

 1, c. pL ii., f. 9, u. e., but not mentioned in the description, nor anywhere 

 else. I am not sure if the inner pointed lobes mentioned before belong 

 to the spinning apparatus ; perhaps the homologous large inner lobes of 

 the Termitina have been here and in Psocina transformed into a spinning 



