Wordpress: Loop secundario

<article id="entradas">
	<?php
	$args = "posts_per_page=4&cat=38";
	$query = new WP_Query($args);
	if ($query->have_posts()) :  while ($query->have_posts()) : $query->the_post(); ?>
		<h3  class="title"><a href="<?php the_permalink() ?>" rel="bookmark" title="Enlace permanente a <?php the_title_attribute(); ?>"><?php the_title(); ?></a></h3>
		<article id="thumbs">
		<?php
			if ( has_post_thumbnail() ) {
				the_post_thumbnail();
			}
		?>
		</article>

		<?php the_excerpt(); ?>
	<?php endwhile; else: ?>
		<p><?php _e('No hay entradas .'); ?></p>
	<?php endif; ?>
</article>