2J)() BULLKTIN 15, IINITKD STATES NATIONAL MUSEUM. 



Described from several speciiiiens. A siiij^le 9 siiecimeu is in the 

 National }Iusciini, reared by Dr. Kiley at St. Louis, Mo., from a<oni8 

 infested with lialaniniiH nasiciis and lilastohasis (/hnidnlcUa; bnt the 

 acorns must have also cjmtained ('ecidoniyiid inciuilines. 



Trichasis rubicola, sp. nov. 



S 9. Length, 1.4 to l.O""". Polished black, iniimnctnred; head 

 with a few transverse aeiculations on the crown. Antennje lOJointed, 

 the scape yellow, the tlagelluni pale brown; pedicel oval; first and 

 tiiird funiclar joints very minute; second much elongated and thick; 

 club 5-jointed, the joints longer than thick. Thorax ovate, with distinct 

 furrows, the base of the nnddlc; h)be eU^vated slightly upon the scu- 

 tellum; scutellum with depressions at sides and base, and with a tuft 

 of ])nbescence at tip; inetai)leura sericeous; teguhe black. Wings 

 hyaline. Legs yellowish, the coxic black, the jjosterior femora and 

 tibia' toward tips, dusky. Abdcmien longer than the head and thorax 

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

 foveohv at base, the third with some jmnctures, the fourth, striated. 



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

 transverse row of punctures; (tlub of .antennie G-jointed, darker coloicd, 

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



Habitat. — ( 'adet, Mo., and District of Columbia. 



Types in Naticmal Museum and Coll. Ashmead. 



Described from many specimens. The National Museum contains 

 specimens, reared by Dr. Riley, June 10, 188.'i, from a ('ecidomyiid ste>n- 

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

 a Cecidoniyiid gall on Vernonia novchoraceHsis, collected at Washington. 



Trichasis arizonensis, sp. nov. 



S 9 , Length, 1.2 to ].G'>"". Very closely allied to T. ruhicola, bnt 

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

 na; being wholly brown-black, the legs darker, brownish or fuscous, the 

 anterior legs, base of middle and posterior tibia; and tarsi pale or 

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

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

 sculpture in both species is similar. 



Habitat. — Mount Graham, Ariz. 



Types in Naticmal Museum. 



Described from specimens reared from a Cecidoniyiid gall on w ild 

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



Trichusis brunneipes ABhin. 



Can. Ent., xix, p. 131, 9 ; Cress. Sj n. Ilym., p. 2eO. 



9. Length, 2'"'". Elongate, polished, black, impunctured; head 

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

 margin of the eye. Antenna; 10-jointed, cyliinbical, the scape and 



