. Bulletin - United States National Museum. Science. 10 UNITED STATES NATIONAL MUSEUM BULLETIN 224 found. "While it is usually stated that the vertex is strongly and characteristically excavated, there are a few exceptions: In Ancylorrhynchus Latreille it may be quite plane; in Damalini the enlarged and flattened eyes are greatly raised above the vertex and in this group and in some Laphriinae, such as Cerotainia Schiner and Rhopalogaster Macquart, the upper oc- ciput and vertex are posteriorly flared and excavated. The face of Asilidae is 'well filled and is in contrast to the sunken, ex
. Bulletin - United States National Museum. Science. 10 UNITED STATES NATIONAL MUSEUM BULLETIN 224 found. "While it is usually stated that the vertex is strongly and characteristically excavated, there are a few exceptions: In Ancylorrhynchus Latreille it may be quite plane; in Damalini the enlarged and flattened eyes are greatly raised above the vertex and in this group and in some Laphriinae, such as Cerotainia Schiner and Rhopalogaster Macquart, the upper oc- ciput and vertex are posteriorly flared and excavated. The face of Asilidae is 'well filled and is in contrast to the sunken, excavated face of rhagionids and there- vids. It is without the deep and conspicuous lateral. Text-Figure 2.—The mouth parts of asilids, as illustrated by Nerax interruptus Macquart. Explanation: 1, the epistoma. 2, maxillary palpus. 3, the labrum. 4, the maxillae. 5, the hypophar- ynx. 6, the labium. punctures and creases of the mydaids and some taba- nids. The vertical, lateral face grooves in the Asilidae are best developed in the Damalini and in Plesiomma Macquart. There is frequently a well developed tu- bercle or gibbosity over the whole or lower part of the face and a marked tendency toward stout, long, conspicuous bristles above the epistoma. These bris- tles are often called the mystax. The antenna is gen- really placed a little above the middle of the head, and in Dioctrini and Erythropogon White it is placed high above the middle of the head, thus shortening the front. Three antennal segments are present and in the majority of genera there is at least one terminal microsegment, small or large, and sometimes there are two well developed microsegments, in addition to a terminal spine, or bristle, which may be likened to an- nuli. The end segment often has such a spine or bris- tle present apically or subapically. In the Asilidae and some others the third segment bears a long, stout bristlelike terminal style or arista. Both front and ocellarium usually bear bristles an
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