The light proceeds from a pair of conspicuous smooth ovoid spots on the pronotum and from an area beneath the base of the abdomen.
The tergite of the prothorax (pronotum) is prominent in all beetles, reaching back to the bases of the elytra and forming a substantial shield for the front part of the body.
The pronotum and elytra are often adorned with bright colours or metallic lustre, and marked with stripes or spots.
The downwardly directed head is covered by the pronotum, and J the three terminal FIG.
In the thorax the pronotum and prosternum are closely associated with the mesothorax, but the pleura of the prothorax are usually shifted far forwards, so that the forelegs are inserted just behind the head.
The Siricidae (" wood-wasps ") are large elongate insects also with one spine on each fore-shin, but with the pronotum closely joined to the mesothorax.
In this division the ovipositor issues from the ventral surface of the abdomen; the pronotum reaches back to the tegulae;.
The pronotum reaches back to the tegulae.
The pronotum extends back to the wingbases, and the " waist " is greatly constricted and marked by one or two " nodes."
In this division are included the rest of the " diggingwasps," distinguished from the Vespoidea by the short pronotum not reaching backward to the tegulae.
The bees which make up this group agree with the Sphecoidea in the short pronotum, but may be distinguished from all other Hymenoptera by the widened first tarsal segment and the plumose hairs on head and body.
The Membracidae are remarkable on account of the backward prolongation of the pronotum After Howard, Year Book U.S. Dept.