NY.AIPIIALINAE : BASILARCIIIA ARCIIIPPUS. 271 



into black; upon tlic fifth abdominal sci^nient and tlio posterior part of the fourth, 

 extending also forward and ])ackAvard in broad streaks over a pai't of the dorsum 

 of the third and sixtli abdominal seijments, is a lari^e, saddle-shaped spot of a dirty, 

 dull cream color, generally tinged slightly with grecnisii ; the mammiform elevation 

 of the second abdominal segment dull, olivaceous Ijrown ; jnst above and beliind the 

 spiracles of the third, fourtli and sixth abdominal segments there is a short, oblique 

 patch of velvety black ; the infrastigmatal fold of the abdominal segments is edged 

 above with white, passing upward a little behind each spiracle, and on the ninth 

 segment broadening into a spot; elongated, tuberculated spine of the second thoracic 

 segment dark mahogany brown, some of the tubercles upon it, especially the apical 

 ones, tipped with pale; it is pretty abundantly supplied with long and large, conical, 

 curving tu])ercles, higher than broad; the minute warts of the body mostly dull, steel 

 blue, but also yelloAvish and purplish; spiracles slate color, edged narrowly with black; 

 legs ])lackish at base, beyond yellowish brown or testaceous ; prologs dirty olivaceous 

 or yellowish brown. 



Some specimens taken on willow (those f oi*ming the basis of the above description 

 were, I believe, all taken on poplar, though fed in part on willow after capture) 

 were delicate, olivaceous green almost throughout, with scarcely any dark, olivaceous 

 tints and none very dark ; the laterodorsal tubercles of the second abdominal segment 

 were dull, brownish yellow ; the infrastigmatal band and the saddle as in the others; 

 but the head was pale olivaceous green. Length of body, 25-30 mm. ; breadth of body, 

 4-5 mm. ; of head, 7 mm. ; length of thoracic tu])ercles, 4-4.5 mm. ; of terminal 

 abdominal tubercles, 1-1.25 mm. 



Chrysalis (83 : 18-20). Head, wings and the appendages in front varying from black- 

 ish gr.een to very dark yellowish broAvn, the legs, tongue and antennae with a greenish 

 tinge ; thorax varying from brownish salmon much mottled with plumbeous to inky 

 olivaceous tinged with dull yellowish ; the mesothorax is darker along the median line 

 and on the middle of either side is a black dot ; next the wings on the sides of the first 

 to the fourth abdominal segments and of the anterior part of the fifth, and sometimes of 

 the metathorax, salmon nacreous, often a little obscure; dorsal tubercle of the second 

 segment, together with a broad streak adjoining the Avhole of the nacreous band 

 beyond the anterior edge of the tubercle, blackish brown; rest of the abdomen 

 whitish or very pale salmon colored, beclouded more or less with fuscous (or Avith 

 a mottling of l)lack and white made up in great part of interlacing streaks, the black 

 predominating) in dorsal, lateral and broad subventral bands, the dorsal band often 

 narrow and deeper in tint, the subventral closely approximated to its neighbor; 

 eighth and succeeding segments blackish brown, often tinged with yellowish, and 

 emitting little tongues of the same color upon the seventh segment, fading into the 

 longitudinal bands. Spiracles of the color of the body with black lips. Length, No. 

 1, 24.5; No. 2, 17.75; No. 3, 22; breadth near tip of wings. No. 1, 8.5; at head, 

 No. 1, 3; No. 2, 2.5; No. 3, 2.0; height at abdominal tubercle, No. 1, 10.25; No. 2, 7.5; 

 No. 3,8.5; at thorax. No. 1, 7.5; No. 2,5.5; No. 3,6.25; height of abdominal tuber- 

 cle. No. 1, 2.5; No. 2, 1.75; No. 3, 2 — all in mm. 



Distribution (19 : 2) . This species is found over nearly the whole of the 

 United States as for west as the Sierra Xevada, and has been found spar- 

 ingly even to the Pacific coast near our northern boundaries (British 

 Columbia and Oregon, — Edwards). It is rare in the extreme west, and 

 I have not noticed its occurrence in Colorado, Arizona or Xew Mexico, 

 though it has been found in southwestern Wyoming by Osten Sacken, in 

 central Utah by Putnam, and near Truckee, Xevada by McGlashan. To 

 the south it appears to reach the Gulf of Mexico, though Ikjw far it pene- 

 trates the peninsular of Florida, where an allied form oxi.sts, I do not 



