► Dr. A. Fitch, Essay on the Wheat-fly, etc. 



CECIDOMYIA. 187 



I. Perfect insect described, habits unknown. 



C. ornata Say, Long's Exped. App. p. 357. Wied. Auss. Zw. I, 22, 2. 



C. caliptera Fitch. 



C. cerealis Fitch. 



C. tergata Fitch. 



C. thoracica Fitch, j 



C. spongivora Walk. List of Dipt. Brit. Mus. I, 30. 



Campylomyza scutellata Say, Journ. Acad. Phil. Ill, 17, 1. Wied. Auss. 



Zw. I, 22, 1. 

 Tritozyga, sp. Lw. (see p. 178). 

 Dijrfosis maccus Lw. The following note on this new species was furnished 



by Mr. Loew: — 



" Gall-gnats cannot be recognizably described from single dried 

 specimens, unless they are distinguished by some striking peculiar- 

 ities. I feel no temptation at all to describe species which have 

 no such peculiarities, and allow myself an exception only with the 

 following Diplosis on account of its remarkable beauty. 



I>. maccus Loew. % and 9. (Tab. I, figs. 11 and 12.) — Flavida, 

 thorace fusco-vittato, antennarum articulis nigris et pallidis alternanti- 

 bus, alis violaceo-maculatis, tibiis tarsisque nigro-annulatis. 



Yellowish, thorax with fuscescent stripes ; the joints of the antennae alter- 

 nately black and whitish ; wings with violet-blue spots ; tibiae and tarsi 

 annulated with black. Long. corp. 0.08. Long. al. 0.11. 



Yellowish ; the joints of the antennse alternately black and 

 yellowish-white, the simple joints being black, the double joints 

 yellowish-white ; also the hairs of the black joints are black, and 

 those of the light ones light. Thorax with three brown longitu- 

 dinal stripes coalescing anteriorly, the intermediate one reaching 

 only to the middle of the thorax, the lateral ones running as far as 

 its posterior margin. Abdomen without dark bands. Coxse yel- 

 lowish. Fore and middle femora black on the upper side and 

 tips, the outermost extremity of the tip being yellowish ; hind 

 femora with a black line not reaching far beyond the middle, and 

 with the tips black. Tibiae black ; anterior ones with a very broad 

 yellowish ring beyond the middle, the hind ones with such a ring 

 at their base and a second ring beyond the middle. Anterior tarsi 

 black on the first, short joint, at the base of the second and at 

 the tips of the second, third and fourth joints ; the hind tarsi have 

 the same markings with the exception of the base of the second 



