DESCRIPTION OF THE SPECIES. 235 



Syn. Trypetafr atria Loew, Monographs, etc., I, p. 67. Tab. II, f. 4. 

 ?Trypeta liogaster Thomson, Eug. Resa, p. 578, No. 251. 



Hab. United States (Osten-Sacken). 



Observation. — I have nothing to add to the description of this 

 species as given in the first part of these Monographs. Its close 

 relationship to the European T. heraclei Lin. is a sufficient 

 proof that this species is a true, typical Acidia. I believe that 

 T. liogaster Thorns, is this same species, although he describes 

 the ovipositor as darker than I find it in my specimen. 



9. T. suavis Lw. % . (Tab. X, f. 10.) — Dilute lutea, corpore brevi, 

 latiusculo, scutello setis quatuor instructo ; alae rivulis latissiinis fuscis, 

 in formam literse S confluentibus, pictse, apice venae longitudinalis 

 quartae non recurvo. 



Pale clay-yellowish, stature short and rather broad, scutellum with four 

 bristles ; wings with very broad brown rivulets, which coalesce in the 

 shape of the letter S ; the tip of the fourth vein is not curved forwards. 

 Long. corp. 0.20; long. al. 0.21. 



Syn. Trypeta suavis Loew, Monographs, etc., I, p. 75. Tab. II, f. 10. 



Hab. Middle States (Osten-Sacken). 



I possess only one very badly preserved specimen, which I 

 described in the Monographs, etc., Part I. The species is easily 

 distinguished on account of the peculiar picture of its wings. Of 

 all the genera hitherto established in the family Trypetidse, the 

 present species undoubtedly belongs to Acidia; and, as far as 

 the imperfect preservation of my specimen allows an opinion, it 

 agrees with the Acidise in all the important characters, except 

 one : while all the European Acidise have the third longitudinal 

 vein more or less bristly, I perceive no bristles, whatever, in 

 T. suavis, and have no reason to suppose that they have been 

 rubbed off. Such an agreement of characters decides me to place 

 T. suavis in the genus Acidia; at the same time, however, the 

 bristles of the third longitudinal vein cannot any longer be con- 

 sidered as characteristic of the genus Acidia. 



10. T. canadensis n. sp. 9 • — Dilute lutescens, segmentis abdomi- 

 nalibus tertio et quarto fusco-fasciatis, corpore brevi, latiusculo, terebra\ 

 mediocri, lata et late truncata; alarum rivuli angusti, fusci, apex venae 

 longitudinalis quartae non recurvus. 



Pale clay-yellowish, with a brown crossband on the third and fourth 

 abdominal segments, stature short and somewhat broad ; ovipositor of 



