232 HUBERT M. MORRIS. 



A brief account, with figures of the larva, pupa and adult, of Plecia fulvicollis. F., 

 an Indian Bibionid, has been published (3). Keilin (4) has given a short account 

 of the alimentary canal in Scatopse notata, Bibio hortitlanus and DilopJms febrilis. 

 That of B. hortiilanus resembles the alimentary canal of B. marci in the absence of 

 the posterior caecum, which however is present in a well developed state in Dilophus 

 febrilis. 



A few additional records of damage to crops by Bibionid larvae have been published 

 also. Carpenter (1) records Bibio larvae as having caused much damage in wheat 

 fields in Co. Cavan, Ireland, in March 1918, by eating the roots of the plants ; and 

 Bibio marci larvae are reported to have damaged potatoes in a " pit " in Co. Louth, 

 in October 1916. 



Molz (5) records Bibio hortulanus larvae as damaging potatoes near Halle in 

 September 1918 by eating beneath the skin. It was noticed that only parts of the 

 field which had been treated with stable manure were infested. Afterwards winter 

 wheat was sown and larvae were found to be feeding on the seed. In experiments it 

 was found that the larvae attacked the seed at the point of germination, and also that 

 only potatoes which had previously been injured were attacked. Potato skins 

 steeped in a 1 per cent, solution of arsenious acid were found to form an attractive 

 and effective poison bait. 



1. Carpenter, G. H. (1920). "Injurious Insects, etc., in Ireland during 1916, 



1917 and 1918." Econ. Proc. Roy. Dub. Soc, ii. No. 15, Nov. 1920. 



2. Curtis, J. (1844). " Bibio marci." Gardeners' Chronicle, 16th Nov. 1844. 



p. 764. 



3. Fletcher, T. B. (1919). " Second Hundred Notes on Indian Insects." Agric. 



Research Inst., Pusa, Bull. 89, p. 58. 



4. Keilin, D. (1919). " On the Alimentary Canal and its Appendages in the 



Larvae of Scatopsidae and Bibionidae (Diptera Nematocera), with some Remarks 

 on the Parasites of these Larvae." Ent. Monthly Mag. (3) v, pp. 92-96. 



5. Molz, E. (1920). " Weitere Beitrage zur Kenntnis der Gartenhaarmiicke {Bihio 



hortulanus, L.)." Zeitschr. angew Entom. Berlin, vii. No. 1, Sept. 1920. pp. 92- 

 96, 3 figs. (Abstract in Rev. App. Ent., 1921, p. 1). 



6. Morris, H. M. (1917). " The larval and pupal stages of Bibio johannis, L." 



Ann. App. Biol, iv, 3, pp. 91-114. 



7. Sorauer, p. (1913). Handbuch der Pflanzenkrankheiten, iii, p. 458. 



