54 BULLETIN 416, U. S. DEPARTMENT OF AGRICULTURE. 
COLEOPTERA. 
COCCINELLIDAE. 
In 1893 Morgan recorded the predatory work of Pentilia sp., 
which was very effective against mites at Baton Rouge, La. Titus 
states that several lady-beetles were observed by him in 1905 feeding 
on the red spider. In 1906, at Washington, D. C., Chittenden (1909) 
found (Scymnus) Stethorus punctum an active enemy of the red spider 
on Gymnocladus. Stethorus punctum was also recorded in 1909 by 
Weldon as one of the principal red-spider enemies in Colorado. 
Worsham (1910) states that Stethorus punctum was the only preda- 
cious species observed in Georgia in the case of the cotton red spider. 
In the Sacramento Valley of California, Parker (1913) found Stethorus 
nanus, S. marginicollis, and Pentilia sp. present in small numbers 
AWW 
) 
OETA 
= 
Fig. 16.—Stethorus punctum, an enemy of the red spider: a, Egg; 6, larva; c, pupa; d, adult. All 
greatly enlarged. a, b,c, redrawn after Weldon; d, Webster. 
in mite colonies. Ewing (1914) found the larve of Stethorus punc- 
tum in the Willamette Valley, Oregon, where he says they were vora- 
cious red-spider enemies. These coccinellids haye been known as 
red-spider enemies for some time, and occur over a large part of the 
United States. 
Stethorus punctum Le Conte (fig. 16).—This is probably the most 
effectual coccinellid enemy of the red spider. We have seen it so 
extremely abundant on infested jack beans and jump-vine leaves 
that the red spider was quickly exterminated. On these host plants 
aS many as a dozen larve and a dozen pup have been seen on a 
single leaf. This is thesamespecies as that observed by J. C. Duffey 
(1891) to exterminate vast colonies of the red spider on Manihot, 
Ficus, Morus, Tilia, and Ipomeea at St. Louis in 1891. Such striking 
