378 



are figured two slender, white lines which look like bristles but 

 might have been intended for the rostral ridges, but on Plate 23, 

 figure 6, they are now shown, or are covered by the lamellar 

 bristles, nor does the rostrum much resemble that of a Humero- 

 bates. On the other hand one reads (p. 231) 'rostrum terminating 

 in a small rounded point, ends of the genae showing anteriorly as 

 small cusps.' This fits Humerobates exactly. Under color, men- 

 tion is made of a translucent spot at anterior edge of notogaster, 

 and of the areae porosae as 'some smaller, more clearly defined 

 spots nearer the edge, much lighter, and semitransparent.' Two 

 species thus seem to have been mixed, as elsewhere. Further- 

 more (p. 231) one reads, as at various other places-, 'English 

 specimens are variable.' Finally on page 233, penultimate line, 

 there appears, 'nymphs in great quantities on the bark of a dead 

 Cedrus deodar a' which is a Himalayan evergreen! 



The type habitat of A. arborea (Banks 1895, p. 7) is 'common 

 on cedar and peach trees.' Dr. Philip Garman of the Connecticut 

 Agricultural Experiment Station, under date of October 23, and 

 concerning specimens sent me, writes: 



'It seems that they are frequently found on dead and dying 

 cedars and there is some question as to their importance in pro- 

 ducing this condition ... on the ornamental cedars on 

 which they were found. Cedars in the open are also frequently 

 infested and the mite can nearly always be found on dead 

 branches in the locality where collected.' 



Thus it would seem that the British do have the genus but 

 masquerading under a different name and the halucination : 

 'variable species of wide distribution.' 



In "Germany (Sellnick 1929, p. 11) H. humeralis is reported on 

 Ericaceae. 



Oudemans (1926, p. 354) thinks Acarus fungorum (Linne 1758, 

 p. 618; see also Linne 1746, p. 349) is the nymph of this species. 

 In this connection see Michael (1884, pi. 5, fig. 2). To me it 

 looks probable but I would prefer more evidence before making a 

 decision. 



American data. — I have examined the following material: 

 Maine, coll. by Gilbert Van Ingen, fifty specimens, slides no. 



26B28a, b, c. Wellfleet, Mass., in moss, 27-33, August, 1918, 



four specimens', slide no. 26B111. 



