32 James Waterston, 



the posterior segments 4 — 6 an indefinite band which is incomplete 

 medianly, darker posteriorly and never reaching the sides. This is 

 best Seen in an old ^. In the ? the coloured tergites show a 

 darkened posterior margin and at the anterior edge a short dark 

 patch on each side of the median line. These patches obscurely 

 fiise with the markings of the posterior margin, but this three 

 spotted appearance is for the $ characteristic. 



The affinities of this species are more obviously with such types 

 as D. serriUmbus N. {lynx torquilla) and D. fallax {Kitta tJialassina) 

 than with any of the B. communis group. More remotely it is 

 connected with D. superciliosus {Dendrocopus). 



B. communis has been reported more than once from Troglodytes 

 but it is unlikely that the present insect has been so referred to. 

 We have seen a Single immature Bocophorus from wren which is 

 possibly to be assigned to the communis type. Ifso it is probably 

 an instance of straggling. B. troglodytis on the other hand is in- 

 variably to be foiind on Troglodytes in its various races. We have 

 seen it now from this host from E. Prussia, England?, Shetland, and 

 Faroe. The present notes are based on Shetland material, as Dr. 

 Dampf's Single example is too immature for description. 



Measurements of B. troglodytis (in mm). 



length breadth length breadth 



Head 0,414 0,371 0,471 0,407 



prothorax 0,107 0,214 0,114 0,228 



metathorax 0,185 0,328 0,192 0.371 



abdomen 0,542 — 0,907 — 



to 

 0,628 



4th Segment — 0,471 — 0,585 



Total 1,24—1,33 — 1,6 — 

 Antennae 



Ist Joint 0,050 0,040 0,040 0,036 



2nd 0,046 0,030 0,043 0,026 



3rd 0,030 0,02(5 0,030 0,026 



4th 0,016 0,026 0,020 0,023 



5th 0,036 0,023 0,033 0,023 



