MACRATRIA.—NOTOXUS. , 203 
11. Macratria nigricornis. (Tab. IX. fig. 12.) 
Black, the anterior part of the head (and the labrum) broadly and abruptly flavo-testaceous, subopaque, thickly 
clothed with fine, silky, brownish pubescence and with scattered erect hairs. Head rather long and 
narrow, very densely and very finely punctured, obliquely narrowed behind the eyes, the occipital channel 
short but deep; eyes moderately large, rather prominent; last joint of the maxillary palpi piceous or 
black, and sometimes the other joints also; antennex black (the basal joint testaceous beneath in one 
example), comparatively stout, gradually widening outwardly, joints 9 and 10 triangular and each con- 
siderably longer and wider than 8, 11 twice as long as 10 and pointed ; prothorax at least one and a 
half times as long as broad, very little wider than the head, the sides moderately rounded anteriorly and 
converging behind, the basilar groove deep, the surface densely, roughly, and confluently punctured ; 
elytra parallel, with somewhat regular rows of fine shallow punctures extending from the base to far 
beyond the middle and a fine longitudinal impressed line extending from the shoulders downwards, the» 
interstices very densely and exceedingly minutely punctured, the sutural one with scattered punctures 
like those of the stria, the apices rounded; legs slender, but with the femora strongly clavate, black, the 
femora broadly testaceous in the middle (the base and apex only black); fifth dorsal and fifth ventral 
segments slightly truncate, and the latter emarginate, in the male. 
Length 43-54 millim. (<¢.) 
Hab. Mexico, Coscomatepec (Sallé); GuatemaLa, Chacoj (Champion); Nicaraava, 
Chontales (Belt). 
Four examples, two of which are certainly of the male sex. This species differs from 
the allied forms in the head being obliquely narrowed behind the eyes. The antenne 
are black, comparatively stout (the intermediate joints becoming gradually wider, so that 
the transition from the eighth to the ninth is not very abrupt), and the eleventh joint 
in both sexes is as long as 9 and 10 united. The interstices of the elytra are more 
minutely and much more densely punctured than in UM. nitidiceps, from which it also 
differs in the denser punctuation and colour of the head. ‘The coloration of the legs is 
apparently constant. 
Group ANTHICIDES. 
The genera Notorus and Anthicus are both well represented in Central America, and 
when the Central-American coast-region is more thoroughly investigated additional 
species of each genus are certain to be discovered. Tanarthrus, Lec., should occur in 
Northern Mexico ; the three known species are from the Colorado Desert and Utah: 
they are said to fly and run on salt mud, after the manner of a Cicindela. 
NOTOXUS. 
Notoxus, Geoffroy, Hist. Ins. envir. Paris, p. 356 (1762) ; La Ferté, Monogr. Anthic. p. 21; Lacor- 
daire, Gen. Col. v. p. 594; Horn, Trans. Am. Ent. Soc. xi. p. 165 (1884). 
Monocerus, Dejean, Cat. 3rd edit. p. 237. 
Ceratoderus, Blanchard, Hist. des Ins. i. p. 40 (1845) (nec Westwood, Mulsant). 
Species of this remarkable genus inhabit most parts of the world. Fourteen are 
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