Publ. 10. VII. 1931. 
PACHYSPHINX; MONARDA; CRESSONIA. By Dr. M. Draudt. 
865 
C. astylus Dm. (= integerrima Harris, io Grey) is the rarest of the 3 species. Distal margin of fore- astylus. 
wing not produced at all subapically and on 3, but quite smooth, transverse markings almost extinct, only 
traceable in the apical part of the costal margin; inner margin very dark. Larva light green with a red la¬ 
teral stripe and small irregular red dorsolateral spots; it lives on Vaccinium, Rosaceae, Andromeda etc. Canada 
to New York and Pennsylvania. — hybr. interfaunus Neumoeg. ist rather intermediary between astylus and 
Sin. ocellatu ; a short apical spine on the anterior tibia is present. 
24. Genus: Paehysplainx R. & J. 
It differs little from Smerinthus. Anterior tibia with a strong apical spine; frenulum absent in both 
sexes. The larvae differ more in the reduced horn, thickened thoracal segments, and the roundish, not so 
triangular head. 
Only 1 species: 
P. modesta Harris (= cablei Reizst., occidentals Echo., populicola Bsd., princeps Why.) (97 f) is a very 
variable species, from whitish-grey to light brown, with two notched transverse lines enclosing the median 
area, hindwing from pink to brown with a dark anal spot. Several subspecies distributed over the whole 
nearctic region. The nomenclatural type is the common eastern form, forewing more darkened distally to the 
anterior transverse line, the pink colour of the hindwing densely covered with brown. Canada to Louisiana, 
to the west as far as California, Oregon and Brit. Columbia. — occidentals Echo. (nec Drc .) is probably a lighter occidentalis. 
summer-breed of the same race. — imperator Stlcr. (97 f), from Arizona, is large, coarsely scaled, with a large imperator. 
light stigma at the cell-end, the transverse lines more undulately dentate, the pink of the hindwing reduced, 
the light inner-marginal area increased, the interior one of the two blackish anal spots long and narrow. The 
nomenclatural type refers to the spring-form with greyish-white forewdngs, the median band is somewhat greyer, 
often with a reddish-yellow tinge. — kunzei R. & J . is the summer-form which is still lighter, the forewing kunzei. 
more yellowish-white, the transverse lines much less distinct or quite extinct, the two anal spots of the hind¬ 
wing scarcely contrast with the yellowish-white ground. Arizona, and besides in Colorado, Sonora, and Lower 
California. — borealis Clark, on the contrary, is still darker than typical modesta, especially on the thorax borealis. 
and abdomen above and in the broad median band of the forewing. Manitoba. — regalis R. do J . is as large regalis. 
as imperator, of a more monotonous and darker colouring with a more reddish tinge, the basal area not so 
contrastingly light; discal lines distinctly undulate-clentate, the distal margin also less undulated, the mar¬ 
ginal area less grey. The red colour on the hindwing is extensive, the inner-marginal area blackened. North 
Mexico (Jalisco and Durango). The intensely granulated larva with transverse pads on the 3 first segments 
and a very short horn lives on Populus and Salix. 
25. Genus: Monarda Drc. 
The only species, apparently very local and extremely rare, has hardly become known hitherto. Pro¬ 
boscis stunted, palpi very small, coarsely haired like the basal part of the inner margin on the wings. An¬ 
tennae long, bipectinate in the <$, tibiae spineless. Wings broad with rounded margins. Frenulum present. 
M. oryx Drc. (97 f) is a most peculiar species. Forewing dark brown, covered with rusty brown scales, oryx. 
the veins broadly olive; double antemedian and postmedian transverse bands are blackish and interrupted 
by the veins. Hindwing pale reddish, smoky at the margin, with a dark, almost straight transverse band. 
The species was originally described from Jalisco (Guadalajara), later on it was found near Tlalpam aqd 
in Cholula and Puebla in the valley of Puebla (cf. the report of Carlos C. Hoffmann in Rev. Mexicana d. 
Biologia, 1922, p. 17 sq.); the specimens from the valley of Mexico (Tlalpam) are browner than the inten¬ 
sely blackened Puebla-specimens. Mr. Hoffmann had the kindness to present us with a specimen for having 
it figured. 
inter¬ 
faunus. 
modesta. 
26. Genus: Cressonia Grt.de Rob. 
Proboscis short and thin; palpi of $ long, divergently bent, of $ shorter; tibiae spined; pulvillus 
present. Distal margin of forewing undulate; costal margin of hindwing straight at first, somewiiat lobate 
beyond the centre. Antennae almost Saturnid-like. 
Only 1 species: 
C. juglandis Abb. do Sm. (= hyperbola Slo.ss., instabilis Martyn , pallens Stkr., robinsoni Btlr.) (97 f). juglandis. 
The brownish-white ground-colour is of a most variable tint, with a slightly angular subbasal line, a straight 
antemedian line which, together with the more oblique undulate postmedian line, encloses the median area 
being darker brown in the proximal half, with a brown discal streak; terminal area brownish enclosing a 
curved, broadly faded light subterminal line. Hinclwing with 2 antemedian lines and a postmedian shaded band. 
Larva green or reddish with lateral oblique stripes anteriorly bordered with red, frequently with red spots before 
VI 109 
