'^'o- 1] EILEY AND MONELL ON APIIIDID^. 21 



On the under side of leaves of Cndcvgus cocclnea. July, Saint Louis, 

 3Io. Described from four specimens. 



Tlie antennte are longer than in any Siphonophora known to me. This, 

 .together with the exceedingly long and slender seventh joint, will easily 

 distinguish it from all described species. 



SiPnoxoPHORA SOXCHELLA, 11. sp.— General color very dark dull greeuisli-browii. 

 Head aud thorax inclined to fuscous. General color of legs green ; apical half of femora, 

 black ; tibiaj dusky at base and apex ; tarsi black. Tail yellowish-green, very long. 

 Nectaries entirely black, reaching to the tip, subcylindric. Dorsum smooth. Anteunte 

 much longer than the body; black; third joint very tubercular; fourth joint dis- 

 tinctly tubercular ; remaining joints not so ; third joint about as long as the fifth, sixth, 

 and seventh joints taken together ; seventh joint as long as the fourth and fifth taken 

 together. Length 2.28—2.78"™; to tip of wings 3.81™°'. 



On SoncJms oleracea. Jufy, Saint Louis, Mo. 



This species is remarkable for the habit of at once dropping to the 

 ground when disturbed. Several other undescribed species which occur 

 on this same plant can be distinguished by ha\ing the third joint of the 

 antennae very much shorter. 



SiPHOXOPHORA CALEXDULJi:, n. 's^.—Aptcrous mdlviduals : General color brownish- 

 black; dorsum smooth and shining, a little reddish towards the nectaries. Legs yel- 

 low, except the knees, tarsi, and apex of the tibiaj, which are jet-black. Nectaries 

 black, subcylindric, very long. Style yellow, slender, acute, two-thirds as long as 

 the nectaries or a little less. Winged individuals: General color black; Jiead and 

 thorax slightly fuscous. Antennte black, half as long again as the body; third joint 

 as long as the sixth and fifth taken together, ^^ery slightly tubercular; the following 

 joints not so. Nectaries slightly fuscous toAvards the apex. AVings hyaline. Length 

 2.28—3.04"™; to tip of wmgs 3.81— 4.56'""\ 



On stems of Calendula micrantha. June — July, Saint Louis, Mo. 



I have specimens of what is perhaps this same species, taken at Cor- 

 dova, 111., on Bidens chrysanthemoides, but haAdng made no notes on the 

 colors, cannot decide positively. 



The allied Jll^orth American species may be arranged as follows : 



A. Body entirely red rudbccJcUv. 



AA. Body dark brown. 

 B. Dorsum smooth. 



C. Third and fourth joints of the antenniB very tubercular soncheUa. 



CC. Fourth joint not tubercular. Third joint short calenduhi: 



BB. Dorsum of the apterous individuals more or less covered with tul)ci- 

 eles ambrosia. 



SlPUOXOPHORA KUDBECKI.E, Fitch. 



This species has been taken at Saint Louis on Yernonia novoiboracen- 

 sis, V. LindheimeHana, Solidago rir/ida, 8. serotina, Bidens ckn/santhc- 

 moides, Anihrosia trijida, Cirsium arvense, SUpMiim perfoUatum^ S. infc- 

 grifolia, and CacaJia suaveolens. A yellowish-red variety has been found 

 on Cirsium. It is rather remarkable that Eatinesque should have over- 

 looked this species, which I believe is the commonest of all American 



