350 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4TH Sex. 
GALAPAGOS ISLANDS 
Family BETHYLIDE 
3. Scleroderma galapagensis Brues. 
This insect was described in the Proceedings of the Cali- 
fornia Academy of Sciences, 4th Ser., II, pt. II, No. 16, June, 
1919, from six females. They are small wingless insects, 
2.5-3 mm. long, and superficially rather resemble ants. It 
seems that these insects when collected were placed in a vial 
containing ants from the same locality, James Island, at about 
2000 feet, December 27, 1905, and naturally a mis-interpreta- 
tion has arisen about their association. They were found to 
be parasitic on beetle larve, for in cutting open decayed trunks 
of a species of Scalesia, one of the endemic Composite that 
reaches its best development in the upland forests where it 
attains the dimensions of a tree, | exposed a number of rather 
large beetle larvee and some pupz, the great majority of which 
belonged to a genus near Parandra (Spondylidz), or to that 
genus. A few of these larve and one pupa were parasitized 
externally by small wasp grubs doubtless those of Scleroderma, 
adults of which were taken in these same beetle borings. 
Family THYNNIDZ 
4, Agriomyia vagans Smith 
One female from Charles Island taken on the voyage of 
H. M. S. “Peterel’’ to the Galapagos Islands. 
The Thynnidz are best developed in part of the Australian 
region, but are also well represented in subtropical and tem- 
perate South America. 
Family MUTILLIDA 
5. Photopsis galapagensis Williams, new species 
Male. Holotype. Length 8.5 mm. Slender. Pale brown, 
with most of the second abdominal and of the following seg- 
ments, except the apex of the body, a darker brown; mandibles 
