- 63 - 
Clerid^.e 
ITecro"bia rufipes (Deg,), th^ rod-leeg^d ham "beetle 
■ Hot. affected by derris.— Van d^r Laan (252) in I936. 
Coccinelliclae 
X pila.chna "borealis (F.), the souash "beetle 
Eoten^ne suspended in water, 1:500, pre^'^nted feeding "by the ad'ilt? 
and even at 1:2,000 feeding was curtailed, — Davidson, renortcd ty Canrtell 
(6b) in 1932. 
Ipilachna dodecagtig^a Muls, 
AlD^ut Uo larvae of differ -^nt inst^-.rg w-re lightly d'jst^d with 
"laleur" plus talc l!l (rotenruie 0.5 percent). These larvae, and also 
the raven'^us fourth instars, were paralyzed after a few h-^urs, ceased 
feeding, and dii^d v/ithin 2U h-^urs. An experiment with 15 adults gave cor- 
responding results; pupae that had "been dusted with the said pov/der mixture 
produced normal t'^etles. — Van der Vecht ( Uoi ) in I936, 
Ipilachna indica Muls. 
Most of the adults and larva.e dir within 2^^ h-^.urs aft-^r "beinfT r)laced 
on the leaves '"f Sr-lanun melon^;pna. which h?„ve TDe?n dusted v;ith a nixture 
of roten'^ne and tapioca fl'^ur. — Federated Malay States Department of Agri- 
culture (12 6) in 1938. [This repoi"* v^-s referred to ry the Imt)-rial Institut' 
(218) in 193s.] 
Epilachna varivestis (M^als.), the Mexican lean "bc-etle 
The West Virginia Depart'-ent of A.-ri culture (|fll) in 1929 stated that 
Dorris^l showed promising results as a repellent and killing ag^nt fnr adult 
Mexican "bean "beetles and as a killing a^ent for their larvae. 
Davidson (^7) in 1930 reported the following results with 8usr.ensi->ns 
of roten^ne in vratrr. Tests were made ~h "bean plants in the fir-Id. 
Insect etage C^nc^ntrati'^n Mortality 
F-rcent 
Overwintered adults 1:5,000 100 
1:10,000 85 
1:20,000 
Fall-brood adults 1:500 -^50 
treated in October 1:250 v'50 
1:125 100 
S~all larvae 1:'^0,000 93. 3 
la field tests half--;Tovn lar'^ae were all killed with ?. dust ^f 1 
part of r-tenone and 99 parts -f diatom-ce-us earth. 
