576 p:xpp:himent station record. 



order to stud\' the unutomy of the mosquito with reference to the pos- 

 sible niig-ration of the worms, sections of infected mosquitoes were 

 made after embedding in celloidin. It was found that the young 

 filari^e, after reaching- their highest stage of development, did not 

 remain passive in the thoracic muscles but left that tissue and. travel- 

 ing forward in the direction of the head, passed into the loose cellular 

 tissue which a])ounds in the prothorax in the neighborhood of the 

 salivary glands. After a short stay in the thorax the worms passed 

 forward into the head and coiled up in the connective tissue below the 

 cephalic ganglion and the salivarj^ duct. From these positions the 

 filaria? make their way into the proboscis through an independent 

 opening in the labium. From this position it is easy to understand 

 how they may infect man. 



The clover-root borer (Hylastes obscurus), F. M. Webster {Ohio 

 Sta. Bui. 112,2)j>. lIf^j-lJi.9^ jfl. 1). — This insect passes the winter in 

 Ohio in all stages, but chiefl}" in the adult condition. The author gives 

 brief descriptions of the insect in its different stages. A table is pre- 

 sented showing the condition in which the insect is found during the 

 different months of the year. At the beginning of the year adults and 

 larva? are present, but pupa3 are seldom seen. The first eggs were 

 found on May IT. and pupa? which were found on March 2 and Ma}^ 31 

 came from hibernating larv». The new brood of larvae begin work 

 during the first week of June. The insect does not attack young 

 clover during the first j^ear, but seems to prefer clover during the 

 second year from the seed. The injury is done largely before the first 

 of August. 



An experiment was tried at the station in devising a method for 

 combating this insect. In June. 1897. a plat of ground 16 by 20 ft. was 

 seeded to red clover. On Jul}- 7, 1899, an examination of the clover 

 plants disclosed the presence of larvae of this insect. On the following 

 day the plat was plowed to a depth of from 4 to 5 in. An examination 

 of this plat on August 10 resulted in finding onty a single pupa and 3 

 nearly full-grown larvae 2 or 3 in. below the surface, while other larvae 

 and pupte were found deeper in the soil. On August 11 an insect 

 cage was placed over a part of this plat to prevent the escape of adult 

 insects. The plat was examined on October 19 with the result that 

 only 4 live beetles were found. The beetles were abundant at the 

 same time in outside fields. 



The author believes that deep and thorough plowing immediatelv 

 after harvesting the first crop of clover will result in the destruction 

 of th(» majority of these insects. 



Combating the gypsy moth (Porthetria dispar), Y. Sjostedt {Med- 

 del. K. Landthr. Sti/r., 1000, No. l,pp. 29, ph. 2, figs. ^).— The author 

 reports an unusually serious outbreak of the gyps}" moth during the 

 past 2 years in the southeastern part of Sweden, in Blekinge and Kal- 



