58 EXPEETMENT STATION RECORD. 



" It seems that Macacus rhesus can be infected with tabardillo invariably 

 by the injection of virulent blood from man taken on the eighth to tenth day 

 of fever. The blood should be diluted with salt solution, as stated previously. 

 Attempts to maintain typhus in the monkey by passage through other monkeys 

 were not succcessful. The monkey may pass through an attack of typhus so 

 mild that it can not be recognized clinically. Vaccination results. The im- 

 munity test is a reliable proof of the previous occurrence or nonoccurrence of 

 typhus at least within a period of one month. Typhus was transmitted to the 

 monkey by the bite of the louse in two experiments, the lice in one instance 

 deri\ing their infection from man and in another from the monkey. Another 

 monkey was infected by typhus through the introduction of the feces and 

 abdominal contents of infected lice into small incisions. Other experiments, in 

 which the immunity tests have not yet been given, corroborate the carrying 

 power of the louse." 



A monograph, of the Myrientomata, A. Beklese {Redia, 6 (1909), Wo. 1, pp. 

 1-182, pis. n, figs. Ui; abs. ui Jour. Roy. Micros. Soc. [London'\, 1910, No. 1, 

 p. 33). — In this monograph the author establishes the order Myrientomata 

 for certain primitive genera. Two families are recognized, namely Acerento- 

 midse and Eosentomid;ie ; the former includes 2 genera (Acerentomon and 

 Acerentulus) and is represented by 8 species, of which 2 are new; the latter 

 family is represented by a single genus Eosentomon and 2 species, of which 

 one is new. The Aeerentomid;^ are without trachea^ or stigmata. 



Investigation of the occurrence of silvertop in meadoAV grass in the 

 neighborhood of Landquart, H. Thomann {Landw. Jnlirh. Schivciz, 22 (1908), 

 Xo. 5, pp. 2-54-267). — It is stated that for a number of years there has been a 

 considerable outbreak of silvertop in meadow grass at Landquart, Switzerland. 

 The results of preliminary investigations extending through one summer, which 

 were conducted by the author are here reported, and an annotated list is given 

 of 9 species of insects, representing 5 orders, which were implicated in the 

 injury in the district where the investigations were made. Observations upon 

 the comparative frequence of injury to different species of grass are reported, 

 258 affected stalks I'epresenting 11 species of grass having been examined. The 

 cause of injury to 107 of the stalks was determined, Aptinothrips rufa having 

 been responsible for the injury to nearly one-third of these. 



Insects injurious to sweet potatoes in New Jersey, J. B. Smith (New Jerscii 

 Stas. Bui. 229, pp. 3-16, pi. 1, flgs. 3). — Notes are presented on the principal 

 insect pests of sweet potatoes in New Jersey. 



The sweet potato flea beetle iClurtocncma conflivis), which passes the winter 

 in the adult stage, leaves hibernation in May and commences to feed on any 

 of the convolvulids and as sweet potato plants are among the first to be found 

 in the field, they bear the brunt of the earlier feeding. The plants are attacked 

 during May as soon as set out, narrow grooves or channels being chewed out 

 on either the upper or the lower side of the leaves. This attack, made while 

 the plants are suffering from the shock of transplanting, causes the leaf to lose 

 its vitality, turn brown and die. If the weather happens to be dry and hot 

 the entire plant dies, or if it does not it grows so slowly that the hill is a poor 

 one at harvest. By the middle of June tlie pest has practically disappeared 

 and nothing more is seen of it until August, when it is again found abundantly 

 on other convolvulids, though not as a rule upon sweet potatoes. Remedial 

 measures consist of an application of arsenicals or a modification of cultural 

 methods. Dipping the plants in a mixture of 1 lb. of arsenate of lead in 10 gal. 

 of water before setting is recommended. By delaying transplanting, the beetles 

 may be forced to bindweeds and other natural food plants and thus a large 

 amount of the injury avoided. 



