y6 Thomas Albert Williams 



robust honey tubes. The insects are very lively and drop quickly 

 from the plants when disturbed. 



Cotypes in the collection of the University of Nebraska (nos. 

 131, 132) and of the U. S. National Museum (nos. 7, 149). 



96. Siphonophora desmodii n. sp. 



Apterous form: General color yellowish green. Antennae longer than 

 the body; I, II and III dusky, remaining joints black. Head very slightly 

 dusky. Eyes red. Abdomen yellowish green. Legs very long, especially 

 the hind pair; yellowish, joints and tarsi dusky to black. Honey tubes 

 black, largest at base and tapering gradually to the tip, annulated. Tail 

 concolorous with abdomen, as long as the honey tubes (0.35 mm.), acute. 



Winged form: General color as in apterous form. Antennae longer than 

 the body, black, or with I and II brown and III paler; VII longest, IV 

 next, it being longer than III ; II is also long in comparison to the rest 

 Head dusky. Eyes red. Neck and prothorax yellowish green. Thorax 

 dusky, w r ith yellowish green membrane. Wings with remarkably clear tex- 

 ture and heavy dark subcostals ; first and second discoidals very straight 

 and with smoky black margins, second discoidal starting equidistant from 

 the first and third; cubital subobsolete at base, arising from the subcostal 

 opposite the stigma, one sixth of the way from its inner end, the second 

 branch very near the apex of the wing, or sometimes wanting entirely or 

 represented by a thickening at the end of the first branch. Stigma dusky 

 brown. Stigmal vein curved for the first half, then almost straight. Ab- 

 domen yellowish green, with brownish spots around the base of the honey 

 tubes. These latter and the tail as in apterous form. Length of body 2.36 

 mm., to tip of wings 3.30 mm. This species is sparsely covered with capi- 

 tate hairs which are thickest on the legs and antennae. 



On under side of leaves and along the flower stalks of Desmo- 

 dium canescens. West Point, July 29, 1890 (Bruner) ; Weeping 

 Water, August 16, 1890. It causes the leaves to curl. A very 

 pretty species having some characters not usually found in this 

 genus, as the smoky borders to the veins ; but I do not think this 

 is sufficient reason for removing it from the genus, since all the 

 other characters are those of Siphonophora. 



Cotypes in the collection of the University of Nebraska (nos. 

 133, 134, 135) and of the U. S. National Museum (nos. ro, 11). 



97. Siphonophora erigeronensis Thomas. 



Thomas, Bull. 111. St. Lab. Nat. Hist., No. 2, p. 7 (1878). 

 Thomas, Ins. 111., 8th Rep., p. 58 (1879). 

 Oestlund, Syn. Aph. Minn., p. 82 (1887). 



160 



