-86- 
This was the species tested mostly by the .United States Department 
of Aericulture in 1919 and 1924, although the commercial powder used was 
a mixture of D. elllptica and D. ull ginos a . —Mclndoo and coworkers 
( 259 , 260 ). ~ 
DERKES HEPTAPHYLLA (L.) Merr. 
This species had insecticidal value.— California Agricultural 
Experiment Station (77, p. 53). 
DERRIS K00LGIBBERAH F. M. Bailey, 
Alooholic extracts were generally efficient, but this species was 
unsatisfactory for insecticidal purposes.— Mclndoo and coworkers 
(260 , pp. 188, 199). 
DERRIS MALACCENSIS (Benth.) Prain. Derris 
This species is effective against lepidopterous larvae.— Gater 
(153 , p. 322). 
This species and D. elllptica are cultivated in Malaya, Philippine 
Islands, Sarawak, and Tndo-China, and practically all the exported 
roots are obtained from these two species.— Ho lman ( 198 , pp. 60, 69, 
71, 73). 
DERRIS 0LIGOSPERMA K. Schum. 
Alcoholic extracts were seldom efficient, and this species wps 
unsatisfactory for insecticidal purposes.— Mclndoo and coworkers 
(260 , pp. 188, 199). 
DERRIS PHILIPPINENSIS Merr. 
The powdered roots of this Philippine species were effective against 
mosquito larvae and aphids.— Castillo ( 81) . 
DERRIS POLYANTHA Perk. 
The powdered roots of this Philippine species were more effective 
against aphids and mosquito larvae than those of either D. elliptioa 
or D. philippinen8i 8 . —Castillo (81). 
DERRIS ROBUSTA Benth. Same as for D. oligosperma . 
DERRIS SCANDENS (Roxb.) Benth. 
Extracts were seldom effioient and this species was unsatisfactory 
for insecticidal purposes.— Mclndoo and coworkers ( 260 , pp. 188, 199). 
This species, which i6 indigenous to Queensland, appears to be of 
no commercial value.— Ho lman (198, p. 74). 
