64 THE SCOTTISH NATURALIST 



of her mouth. It seemed to me that this might be the 

 structure that Burgess calls " the fork," a use for which 

 he was at a loss to suggest. It is a chitinous tube forming 

 a quite unique part of each maxilla, and slightly forked at 

 the end in many species, though not bifurcating in 5. 

 cruciatiis. 



The above observations were made in an Edinburgh 

 garden in 191 1, where 6". cruciahis was very abundant. Since 

 that year, however, I have searched there for it in vain. 



The following are the characters of 5. cruciatus as 

 given by M'Lachlan in his monograph on the Psocidae in 

 the Ent. Mo. Mag, for 1 866-7 :— 



" Antennpe not so long as the wings, moderately thick, varying 

 from yellowish to fuscous, according to the degree of maturity 

 attained by the insect. Head shining chestnut brown; the vertex 

 on either side of the ocelli yellowish. Thorax chestnut brown. 

 Abdomen yellowish or fuscescent. Legs pale yellow, the tarsi 

 obscure. Wings hyaline; anterior wings with four elongate 

 fuscous spots near the base, two of which are placed on the posterior 

 margin and the other two above them. These spots vary greatly in 

 intensity. The apical half of these wings is without spots, but there 

 are pale greyish brown bands, one placed along the apical margin 

 and the others following the course of the veins ; pterostigma 

 elongate, dilated in the middle ; veins brown ; the posterior wings 

 have frequently two pale greyish brown spots on the dorsal margin 

 near the base. 



" Length of the body, i to i-|"' ; expanse of fore-wings, 3 to 3^'". 

 Very common on tree-trunks, palings, etc. 



"Characters of the genus Stenopsoa/s.^ Tarsi 2-jointed. Ptero- 

 stigma connected {i.e. by a veinlet not existing in Fsocns). 

 Discoidal cell complete, less quadrangular than in Fsoais, rather 

 irregular. Four complete cellules on the apical half of the posterior 

 margin, the last triangular and pedunculated." 



My observations on the hatching of .5". cniciatus 

 corroborate an account given by Paul de Peyerimhoff in 

 the Annals of the E^itoniological Society of France, vol. Ixx., 

 1901, pp. 1 50-2. This paper was brought to my notice just 

 as my own observations were going to press. Peyerimhoff's 



^ The species which forms the subject of the present paper is now 

 usually placed in the genus GrapJiopsocus of Kolbe. — [Eds.] 



