PLATE XVIII. 
Fig. 1. Triquetra grossa, page 91. Imago with its conspicuous supra-humeral processes 
and horn. The male insect. 
Fig. A The female of the same. 
Fig. la. The front view of the same insect. 
Fig. 3 Triquetra submaculafa, page 92. 
Fig. 3 a. Frons with the dark '-pot on the metopidium. 
Fig. 3b. Pronotum in profile. 
Fig. 4. Triquetra negrustrigata, pag\ 92. The dorsal horn is small. 
Fig. 4a. Frons and metopidium. 
Fig. 5. Micro-schema obtusa, page 92. The dorsal horn is obsolete. 
Fig. 5a. The head seen from below and slightly fore-shortened. 
Fig. G. Microschema inermis, page 93. Imago with no dorsal spine. The male 
Fig. 6a. Dorsal view of the same insect. 
Fig. 6b. The tegmen with its numerous transverse nervures. 
