. Blood-sucking mosquitoes of the subtribe Culisetina (Diptera, Culicidae) in world fauna. Mosquitoes. 57. Fig. 33. Structure of head of fourth instar larvae (ventral view). il—inner lobe of labrum; gp—gular plate; md—mandible; ol—outer lobe of labrum; oc—occipital foramen: smt—submentum;/s—frontal suture; es—epistomal suture; fr—frontoclypeal plate; ml—middle lobe labrum; lm—outer lobe of labrum. along the median gular suture. The variations of relative collar length with age described for Anopheles larvae of different stages do not apply to Culisetina and to many other Culicidae. Eyes. In la
. Blood-sucking mosquitoes of the subtribe Culisetina (Diptera, Culicidae) in world fauna. Mosquitoes. 57. Fig. 33. Structure of head of fourth instar larvae (ventral view). il—inner lobe of labrum; gp—gular plate; md—mandible; ol—outer lobe of labrum; oc—occipital foramen: smt—submentum;/s—frontal suture; es—epistomal suture; fr—frontoclypeal plate; ml—middle lobe labrum; lm—outer lobe of labrum. along the median gular suture. The variations of relative collar length with age described for Anopheles larvae of different stages do not apply to Culisetina and to many other Culicidae. Eyes. In larvae of all stages we find simple eyes which are pre- served in the pupae and adult mosquitoes. In adults they do not function as they are covered by scales. Compound faceted eyes are found (although very poorly developed) even in the second instar larvae; they are distinctly visible in the third instar larvae and attain complete development only in the larvae of the fourth stage. The compound eyes are crescent-shaped (Fig. 28, E) and set on the genae at the widest portion of the head, descending dorsally and ventrally. The simple eyes in the form of small, also crescent-shaped spots (at least in the fourth instar larvae), are set immediately posterior to the compound eyes. In juvenile larvae, the shape of the simple eyes is more rounded, especially in the first instar larvae. Chaetotaxy of head (Figs. 28 and 33): The complete set of setae consists of 21 pairs on the head visible dorsally and ventrally with- out any segmentation of their individual parts (Marshall, 1938). In Culisetina mosquitoes, as in all other genera, not all the setae are. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Maslov, A. V; Ward, Ronald A. Washington : Smithsonian Institution Libraries : National Science F
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