72. Hippoboscidae - louse flies, keds (Order Diptera) obligate parasites of mammals and birds - disease vector! Identification This group includes wingless and winged forms. Most winged ones are dark brownish and smaller than house flies. Flat shape and leathery appearance. Life Cycle Females rear one offspring at a time, the larva feeding in utero from special "milk" glands. The mature larva is "born alive" and immediately pupates in the soil (or on the host in some cases).