1909] Gall Midges of the Goldenrod. 245 



peculiar, long, fusiform galls of Rhopalomyia jusijormis and 

 Rhopaloniyia pedicellata may occur among the flower buds, arise 

 from the leaves or even from portions of the stem, indicating 

 that these two species in all probability have a somewhat 

 extended breeding period. Goldenrod is a marked favorite 

 with the genus Rhopalomyia, some 17 species existing at its 

 expense and producing galls on all portions of the plant. Nine 

 species of Baldratia may be reared from members' of this genus 

 all producing characteristic blister-like, apparently fungous 

 affected, variously colored spots in the leaf tissues. The four 

 species of Lasioptera reared from this genus live for the most part 

 in goldenrod stems, while the peculiar Camptoneuromyia adhesa 

 has been, reared from the oval gall between adherent leaves 

 noticed above, in connection with Asphondylia monacha. It is 

 probable that further rearings would result in the discovery 

 of additional species living upon goldenrod. 



The following table of galls supplemented by extremely 

 brief descriptions of the insects bred therefrom, will doubtless 

 prove of service to any one interested in this subject. Members 

 of the genus Rhopalomyia are usually rather large, reddish or 

 reddish browm insects, easily recognized by the simple claws, 

 theuni- or biarticulate palps and the stemmed ante nnal segments 

 (in the male at least) bearing distinct whorls of hairs. The frac- 

 tion following the number of antennal segments indicates the 

 relative length of the stem of the fifth antennal segment, the 

 length of the basal enlargement being the unit of length in every 

 instance. Members of the genus Lasioptera and Baldratia are 

 easily distinguished by the usually fuscous and white markings, 

 and the dark scales along the anterior border of the wings, the 

 first and second veins being very close to costa. The two genera 

 are readilv separated by the fact that Lasioptera has quadri- 

 articulate p'alpi, while Baldratia has these organs uni- or 

 biarticulate. Members of the latter genus breed almost ex- 

 clusively in blister galls though a few may be found emerging 

 from under the epidermis of nearly normal leaves. The genus 

 Camptoneuromyia is allied to Lasioptera and easily distinguished 

 therefrom by the strongly curved third vein which unites with 

 costa near the distal third. The heavy bodied Asphondylia has 

 long, cylindric antennal segments and a needle-like ovipositor. 



Flower galls. 



Gall greenish or reddish, subglobular, bud-like, 2 mm in 

 diameter. Male, length 2.5 mm, yellowish red, 18-20 

 antennal segments, stem 1. 



Rhopalomyia racemicola O.S. 



