STEGNOCEPHALA. 123 
region contained in my collection are too trivial to be regarded as specific. In 
S. perplexa the head, thorax, underside, and legs are flavous or fulvous, and the 
elytra metallic blue or violaceous. 
2. Stegnocephala costata. (Tab. XXXVIII. fig. 4.) 
Broadly ovate, robust, fulvous, the apical joints of the antenne and the scutellum black; thorax scarcely 
perceptibly punctured; elytra dark metallic blue, strongly punctured, the interstices strongly longitudi- 
nally costate. 
Length 14 line. 
Head impunctate ; eyes closely approached ; antennez scarcely half the length of the body, black, the lower 
four joints fulvous; thorax strongly deflexed at the sides, the latter much narrowed in front and rapidly 
and obliquely converging from the base, the surface finely and very obsoletely punctured; scutellum 
elongate, triangular, black, impunctate; elytra raised at the base, the shoulders very prominent and 
tuberculate, the punctures deep and closely placed, the interstices strongly costate throughout ; epipleurse 
black, produced at the base, and coarsely punctured. 
. Hab. Panama, Bugaba (Champion). 
S. costata, of which only a single specimen was obtained, differs from S. perplexa in 
the strongly costate elytral interstices. 
3. Stegnocephala longicornis. (Tab. XX XVIII. fig. 5.) 
Subcylindrical, robust, black ; antenne long and filiform, the basal joints fulvous; thorax deeply depressed at 
the base, finely punctured ; elytra reddish-fulvous, strongly punctate-striate, a sutural spot below the 
middle black. 
Length 14 line. 
Head finely granulate ; the eyes very closely approached in the female, touching at the vertex in the male; 
the epistoma bounded by a transversely raised ridge between the antenne; the anterior edge of the 
labrum and the palpi fulvous ; antenne two-thirds the length of the body, filiform and slender, the lower 
four joints fulvous, the others black; thorax more than twice as broad as long at the base, much 
narrowed in front, the sides with a very narrow margin, the posterior margin strongly oblique, the surface 
rather closely and finely punctured, with a deep transverse depression in front of the scutellum, the 
depression rather strongly punctured; scutellam elongate, pointed, with a fovea at its base; elytra convex, 
subcylindrical, scarcely narrowed posteriorly, the shoulders very prominent, the lateral lobe strongly 
subangularly produced, the surface very deeply punctured, the punctures more finely impressed poste- 
riorly, the interstices slightly convex and minutely punctured, the surface of a bright reddish-fulvous 
colour, with a common black ovate spot placed across the suture below the middle and slightly prolonged 
into a point upwards ; underside and legs piceous; prosternum much broader than long, rugosely punc- 
tured, the posterior margin but slightly concave, the angles acute. 
Hab. Panama, Bugaba, Volcan de Chiriqui, Caldera (Champion). 
If the antenne and the prosternum of the present insect are examined, it will be 
seen that S. /ongicornis cannot find its place in either Cryptocephalus or Monachus, and 
that it agrees much better with Stegnocephala; but even from the last-named genus 
the entirely filiform antenne seem to separate it. Suffrian has described several species 
of Monachus which have a similarly depressed or posteriorly grooved thorax, and are 
also somewhat allied in their system of coloration to the present insect ; S. longicornis 
cannot, however, be possibly mistaken for any true species of Monachus. 
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