elytral

bicolor differs from all other described species of Ischyomius in that it possesses short, subserrated antennomeres, very wide pronotum, and rounded (not spiniform) elytral apices.

Diagnosis: Males of this species are distinguished by the combination of the medially depressed supra-antennal carinae and costate elytral intervals.

The parallel elytral striae are composed of rows of regular more or less equidistant symmetrical pits.

Polymorphs with number of elytral spots varying from few to 13 spots, commonly six along with one spot on the mid-dorsal line of junction of elytra near the scutellum (Fig.

Diagnosis: There are thirteen elytra with the first pair largest and the remainder small button-like discs that are often mistaken as elytral scars.

Because of its extreme polymorphism with regard to elytral color, H.

Rutelisca flohri Bates, 1888, is distinguished by its elytral striae (lacking in R.

Compound microstructures and wax layer of beetle elytral surfaces and their influence on wetting properties.

Acratus is considered a genus between the Ithystenini and the Nemocephalini (SOARES, 1970); it differs from slender Proteramocerus and Teramocerus by the sturdy body (except Acratus apicalis); the head and rostrum are shorter than either Proteramocerus or Teramocerus; the prothorax is pyriform or cylindrical, sulcate; the elytral apex is rounded; the first tarsal segment is almost as long as the length of 2nd and 3rd together.

The most important non-genitalic characters defining these taxa were elytral punctation density and metacoxal punctation density.

The relationship of pronotal patterns to elytral patterns in females was different than in males.

monalisa seen at Khor al-Beidhah (including the sexually active individuals) showed colouration consistent with the two earlier UAE records: the head and thorax were mostly a metallic copper colour, rimmed with green, and the elytral markings were more or less black (Fig.