ZOOLOGY AND BOTANY, MICROSCOPY, HTC. 43 



proved sufficiently elastic to embrace all the large green and pink apliids 

 found upon this host. Just how many of these there may prove to be 

 when the subject has been more thoroughly studied it is still too soon 

 to say. But it is certain that there are at least three species of Macro- 

 siphuni common on the rose in Maine, and that each of these has pink 

 and green varieties. The three are 31. rosae proper, which does not 

 migrate ; 31. solanifolii, which migrates to the potato ; and 31 . pseudorosse 

 sp. n., which migrates to ragworts. Eleven more new species of 3Iacro- 

 siphum are described, and a key to forty eastern American species is 

 given. There is also a continuation of the food-plant catalogue of the 

 AphididfB of the world, extending from the dogwood to the nightshade 

 family. J. A. T. 



Formosan Termites. — Masamitsu Oshhia (F/iilippine Journ. Sci., 

 1919, 15, 319-83, 13 pis., 5 figs.). In Formosa there are three termites 

 which injure wooden structures : Leucotermes Jiaviceps, Coptotermes fnrmo- 

 scmu.s, and Oilonfofermes formosanns. A pair of mature individuals of 

 C'optotermes is able to start a new colony.; in a newly established colony, 

 egg-laying begins 5-13 days after swarming ; an individual lavs 1-4 

 eggs a day ; the eggs hatch in 24-32 days ; the soldier develops from 

 the egg laid by the queen ; this species attacks lime mortar, but its 

 principal food is cellulose. The termite-proof concrete layer is entirely 

 satisfactory in preventing the entrance of termites from the ground ; 

 teak and cypress pine are immune ; the resistance of timber- is not due 

 to hardness or weight, nor to the inorganic compounds in it, but to 

 organic compounds which can be extracted by benzine or alcohol — 

 namely, sequiterpene alcohol. As camphor green oil contains 25 p.c. 

 of sequiterpene alcohol it is entirely satisfactory as a preventive for 

 buildings. The anthracene oil fractionated from coal tar is effective in 

 preventing the damage of Odontotermesformosanus. J. A. T. 



5. Arachnida. 



Sensory Setae of Arachnids. — Friederich Dahl {Zool. Anzeiij., 

 1920, 51, 215-9). Stiff tactile setge, innervated at their base, issuing 

 through fine pores in the cuticle, occur in all Arachnids. Thicker, 

 firmly imbedded, spine-like structures, without a nerve at their root, are 

 probably protective. The fine hairs of Arfjyroneta prevent the animal 

 being wetted. But there is another type of seta, delicate and very 

 mobile, always arising from a pit. They are peculiar to Arachnids. 

 Tliey move at a breath ; they vibrate at a sound. They sometimes 

 occur in regular lines, "bahl called them " auditory setre " in 1883; 

 Krtepelin used the term " trichobothria." Dahl regards them as 

 percipient of sounds. J. A. T. 



Structure of Pantopoda.— J. C. C. Loman (Ti/dschr. XederJand. 

 DierJc. !>/•., 1917, 16, 53-102, 1 pi., 24 figs.). Much assistance in 

 investigation was obtained by feeding Fhoxidulidium femoratum and 

 Nymphon ruhrum on Tubularia heads which had been coloured with 

 neutral red (a chemical union, unlike colouring with methvlene-blue, 



