2hG BULLETIN !.-), UNITED STATES NATIONAL MUSEUM. 



Described Ironi several speeiiiieiis. A single 9 si)eciinen is in the 

 Nutioiml iMuseuni, reared by Dr. Kiley at St. Lonis, JNIo., from acorns 

 infested uith Balaninns nasicKs and Blaatohasis (jlandulella ; but the 

 acorns must liave also contained Cecidomyiid incjuilines. 



Trichasis rubicola, sp. nov. 



$ 9. Length, 1.4 to l.G"'"'. Polishe<l black, impunctured; head 

 with a few transverse aciculations on the crown. AntennjB 10-jointed, 

 the scai)e yellow, the tiagellum pale brown; pedicel oval; first and 

 third fiiniclar joints very minute; second much elongated and thick; 

 club S-Jointed, the joints longer than thick. Thorax ovate, with distinct 

 furrows, the base of the middle lobe elevated slightly upon the scu- 

 tellum; scutellum Mith depressions at sides and base, and with a tidt 

 of pubescence at tip; metai)leura sericeous; teguhiB black. Wings 

 hyaline. Legs yellowish, the coxa^ black, the posterior femora and 

 tibiae toward ti[)s, dusky. Abdomen longer than the head and thorax 

 together, ])ointed at tip, the petiole tinted, the second segment with 2 

 foveohe at base, the third with some punctures, the fourth, striated. 



In the male, the fourth, fifth, and sixth abdominal segments have a 

 transverse row of punctures ; club of antennae G-jointed, darker colored, 

 the joints cylindrical, at least thrice as long as thick. 



Habitat. — C'adet, INFo., and District of Columbia. 



Types in National Museum and Coll. Ashinead. 



Described from many specimens. The National Museum contains 

 specimens, reared by Dr. Riley, June 1(1, ISS."), from a Cecidomyiid stem- 

 gall on lilackberry at Cadet, Mo.; and others reared June 0, 1S8(», from 

 a Cecidomyiid gall on Vcrnonia vorrhoracoisis, collected at Washington. 



Trichasis arizonensis, sp. nov. 



S 9. Length, 1.2 to ].(>""". Very closely allied to T. r?^/>/co^/, but 

 ditfers in the vertex of the head being distinctly aciculated, the anten- 

 nae being wholly brown-black, the legs darker, l)rownish or fuscous, the 

 anterior legs, base of middle and ])Osterior tibia' and tarsi pale or 

 honey-yellow; while the 5-jointed club in the 9 is more slender than 

 in T. vKhieoIa, with the joints at least twice as long as thick. The 

 sculptures in both species is similar. 



Habitat. — Mount Graham, Ariz. 



Types in Natiimal IVIuseuui. 



Described from specimens reared from a Cecidomyiid gall on wild 

 sunflower, received from Mr. II. K. Morrison. 



Trichasis brunneipes Ashni. 



Can. Ent., xix, p. 131, 9 ; Cress. Syn. Ilym.. p. 2?0. 



9. Length, 2""". Elongate, i)olished, l>lack, impunctui<'d; head 

 transverse, the lateral ocelli a little more than their width from the 

 margin of the eve. Antenna' 10-jointed, cylindrical, the scape and 



